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• Early history of distance learning
  • Early educational theories and technologies
• Modern distance learning

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Distance learning, also called distance education, e-learning, and online learning, form of education in which the main elements include physical separation of teachers and students during instruction and the use of various technologies to facilitate student-teacher and student-student communication. Distance learning traditionally has focused on nontraditional students, such as full-time workers, military personnel, and nonresidents or individuals in remote regions who are unable to attend classroom lectures. However, distance learning has become an established part of the educational world, with trends pointing to ongoing growth. In U.S. higher education alone, more than 5.6 million university students were enrolled in at least one online course in the autumn of 2009, up from 1.6 million in 2002.

An increasing number of universities provide distance learning opportunities. A pioneer in the field is the University of Phoenix, which was founded in Arizona in 1976 and by the first decade of the 21st century had become the largest private school in the world, with more than 400,000 enrolled students. It was one of the earliest adopters of distance learning technology, although many of its students spend some time in classrooms on one of its dozens of campuses in the United States, Canada, and Puerto Rico. A precise figure for the international enrollment in distance learning is unavailable, but the enrollment at two of the largest public universities that heavily utilize distance learning methods gives some indication: in the early 21st century the Indira Gandhi National Open University, headquartered in New Delhi, had an enrollment in excess of 1.5 million students, and the China Central Radio and TV University, headquartered in Beijing, had more than 500,000 students.

Students and institutions embrace distance learning with good reason. Universities benefit by adding students without having to construct classrooms and housing, and students reap the advantages of being able to work where and when they choose. Public-school systems offer specialty courses such as small-enrollment languages and Advanced Placement classes without having to set up multiple classrooms. In addition, homeschooled students gain access to centralized instruction.

Characteristics of distance learning

Various terms have been used to describe the phenomenon of distance learning. Strictly speaking, distance learning (the student’s activity) and distance teaching (the teacher’s activity) together make up distance education. Common variations include e-learning or online learning, used when the Internet is the medium; virtual learning, which usually refers to courses taken outside a classroom by primary- or secondary-school pupils (and also typically using the Internet); correspondence education, the long-standing method in which individual instruction is conducted by mail; and open learning, the system common in Europe for learning through the “open” university (see below).

Four characteristics distinguish distance learning. First, distance learning is by definition carried out through institutions; it is not self-study or a nonacademic learning environment. The institutions may or may not offer traditional classroom-based instruction as well, but they are eligible for accreditation by the same agencies as those employing traditional methods.

Second, geographic separation is inherent in distance learning, and time may also separate students and teachers. Accessibility and convenience are important advantages of this mode of education. Well-designed programs can also bridge intellectual, cultural, and social differences between students.

Third, interactive telecommunications connect individuals within a learning group and with the teacher. Most often, electronic communications, such as e-mail, are used, but traditional forms of communication, such as the postal system, may also play a role. Whatever the medium, interaction is essential to distance education, as it is to any education. The connections of learners, teachers, and instructional resources become less dependent on physical proximity as communications systems become more sophisticated and widely available; consequently, the Internet, mobile phones, and e-mail have contributed to the rapid growth in distance learning.

Finally, distance education, like any education, establishes a learning group, sometimes called a learning community, which is composed of students, a teacher, and instructional resources—i.e., the books, audio, video, and graphic displays that allow the student to access the content of instruction. Social networking on the Internet promotes the idea of community building. On sites such as Facebook and YouTube, users construct profiles, identify members (“friends”) with whom they share a connection, and build new communities of like-minded persons. In the distance learning setting, such networking can enable students’ connections with each other and thereby reduce their sense of isolation.

Early history of distance learning

Correspondence schools in the 19th century

Geographical isolation from schools and dispersed religious congregations spurred the development of religious correspondence education in the United States in the 19th century. For example, the Chautauqua Lake Sunday School Assembly in western New York state began in 1874 as a program for training Sunday school teachers and church workers. From its religious origins, the program gradually expanded to include a nondenominational course of directed home reading and correspondence study. Its success led to the founding of many similar schools throughout the United States in the chautauqua movement.

It was the demand by industry, government, and the military for vocational training, however, that pushed distance learning to new levels. In Europe, mail-order courses had been established by the middle of the 19th century, when the Society of Modern Languages in Berlin offered correspondence courses in French, German, and English. In the United States, companies such as Strayer’s Business College of Baltimore City (now Strayer University), which was founded in Maryland in 1892 and included mail-order correspondence courses, were opened to serve the needs of business employers, especially in the training of women for secretarial duties. Most nonreligious mail-order correspondence courses emphasized instruction in spelling, grammar, business letter composition, and bookkeeping, but others taught everything from developing esoteric mental powers to operating a beauty salon. The clear leader in correspondence course instruction in American higher education at the end of the 19th century was the University of Chicago, where William Rainey Harper employed methods that he had used as director of the Chautauqua educational system for several years starting in 1883.

Early educational theories and technologies

Behaviourism and constructivism

During the first half of the 20th century, the use of educational technology in the United States was heavily influenced by two developing schools of educational philosophy. Behaviourism, led by the American psychologist John B. Watson and later by B.F. Skinner, discounted all subjective mental phenomena (e.g., emotions and mental images) in favour of objective and measurable behaviour. The constructive approach arose from ideas on progressive education advanced by the American philosopher John Dewey and others, who emphasized the education of the “whole child” to achieve intellectual, physical, and emotional growth and argued that learning is best accomplished by having children perform tasks rather than memorize facts. Constructivism, whose leading figure was the French developmental psychologist Jean Piaget, asserted that learning arises from building mental models based on experience. These theories led to different techniques for the use of media in the classroom, with behaviourism concentrating on altering student behaviour and constructivism focusing on process- and experience-based learning.

Technological aides to education

One of the first technological aides to education was the lantern slide (e.g., the Linnebach lantern), which was used in the 19th century in chautauqua classes and lyceum schools for adults and in traveling public-lecture tent shows throughout the world to project images on any convenient surface; such visual aides proved particularly useful in educating semiliterate audiences. By the start of the 20th century, learning theories had begun concentrating on visual approaches to instruction, in contrast to the oral recitation practices that still dominated traditional classrooms.

The first significant technological innovation was made by the American inventor Thomas Edison, who devised the tinfoil phonograph in 1877. This device made possible the first language laboratories (facilities equipped with audio or audiovisual devices for use in language learning). After World War I, university-owned radio stations became commonplace in the United States, with more than 200 such stations broadcasting recorded educational programs by 1936.

Edison was also one of the first to produce films for the classroom. Many colleges and universities experimented with educational film production before World War I, and training films were used extensively during the war to educate a diverse and often illiterate population of soldiers in a range of topics from fighting technique to personal hygiene. Improvements in filmmaking, in particular the ability to produce “talkies,” were put to use just before and during World War II for technical training and propaganda purposes. While the most artistically acclaimed propaganda production may have been Triumph of the Will (1935), one of a series of films made by Leni Riefenstahl during the 1930s for the German Nazi government, similar films were produced by all the major belligerents. In the United States the army commissioned Hollywood film director Frank Capra to produce seven films, the widely acclaimed series Why We Fight (1942–45), in order to educate American soldiers on what was at stake.

Instructional television courses began to be developed in the 1950s, first at the University of Iowa. By the 1970s community colleges all across the United States had created courses for broadcast on local television stations. Various experiments in computer-based education also began in the 1950s, such as programmed or computer-assisted instruction, in which computers are used to present learning materials consisting of text, audio, and video and to evaluate students’ progress. Much of the early research was conducted at IBM, where the latest theories in cognitive science were incorporated in the application of educational technology. The next major advancement in educational technology came with the linking of computers through the Internet, which enabled the development of modern distance learning.

Online learning may not appeal to everyone; however, the sheer number of online learning sites suggests that there is at least a strong interest in convenient, portable learning options — many of which are study-at-your-own-pace. For your reference, we’ve selected 50 top learning sites and loosely collected them into the categories you’ll find below. While this is not a rankings list by any means, (for that you should consult our ranking of the best online colleges) by using a variety of criteria, we’ve filtered in some of the most popular sites in each category.

Featured Online Schools

Many of these sites offer free lessons; some require payment or offer verified certification for a nominal fee. Some sites offer very general non-academic lessons, others provided actual college / university curriculum course material. Whatever you are looking to learn, check out the list below before trying to wade through pages of search engine listings.

Art and Music

• Dave Conservatoire — Dave Conservatoire is an entirely free online music school offering a self-proclaimed “world-class music education for everyone,” and providing video lessons and practice tests.
• Drawspace — If you want to learn to draw or improve your technique, Drawspace has free and paid self-study as well as interactive, instructor-led lessons.
• Justin Guitar — The Justin Guitar site boasts over 800 free guitar lessons which cover transcribing, scales, arpeggios, ear training, chords, recording tech and guitar gear, and also offers a variety of premium paid mobile apps and content (books/ ebooks, DVDs, downloads).

Math, Data Science and Engineering

• Codecademy — Codecademy offers data science and software programming (mostly Web-related) courses for various ages groups, with an in-browser coding console for some offerings.
• Stanford Engineering Everywhere — SEE/ Stanford Engineering Everywhere houses engineering (software and otherwise) classes that are free to students and educators, with materials that include course syllabi, lecture videos, homework, exams and more.
• Big Data University — Big Data University covers Big Data analysis and data science via free and paid courses developed by teachers and professionals.
• Better Explained — BetterExplained offers a big-picture-first approach to learning mathematics — often with visual explanations — whether for high school algebra or college-level calculus, statistics and other related topics.

Design, Web Design/ Development

• HOW Design University — How Design University (How U) offers free and paid online lessons on graphic and interactive design, and has opportunities for those who would like to teach.
• HTML Dog — HTML Dog is specifically focused on Web development tutorials for HTML, CSS and JavaScript coding skills.
• Skillcrush — Skillcrush offers professional web design and development courses aimed at one who is interested in the field, regardless of their background — with short, easy-to-consume modules and a 3-month Career Blueprints to help students focus on their career priorities.
• Hack Design — Hack Design, with the help of several dozen designers around the world, has put together a lesson plan of 50 units (each with one or more articles and/or videos) on design for Web, mobile apps and more by curating multiple valuable sources (blogs, books, games, videos, and tutorials) — all free of charge.

General – Children and Adults

• Scratch – Imagine, Program, Share — Scratch from MIT is a causal creative learning site for children, which has projects that range from the solar system to paper planes to music synths and more.
• Udemy — Udemy hosts mostly paid video tutorials in a wide range of general topics including personal development, design, marketing, lifestyle, photography, software, health, music, language, and more.
• E-learning for kids — E-learning for Kids offers elementary school courses for children ages 5-12 that cover curriculum topic including math, science, computer, environment, health, language, life skills and others.
• Ed2go — Ed2go aims their “affordable” online learning courses at adults, and partners with over 2,100 colleges and universities to offer this virtual but instructor-led training in multiple categories — with options for instructors who would like to participate.
• GCF Learn Free — GCFLearnFree.org is a project of Goodwill Community Foundation and Goodwill Industries, targeting anyone look for modern skills, offering over 1,000 lessons and 125 tutorials available online at anytime, covering technology, computer software, reading, math, work and career and more.
• Stack Exchange — StackExchange is one of several dozen Q+A sites covering multiple topics, including Stack Overflow, which is related to computer technology. Ask a targeted question, get answers from professional and enthusiast peers to improve what you already know about a topic.
• HippoCampus — HippoCampus combines free video collections on 13 middle school through college subjects from NROC Project, STEMbite, Khan Academy, NM State Learning Games Lab and more, with free accounts for teachers.
• Howcast — Howcast hosts casual video tutorials covering general topics on lifestyle, crafts, cooking, entertainment and more.
• Memrise — Lessons on the Memrise (sounds like “memorize”) site include languages and other topics, and are presented on the principle that knowledge can be learned with gamification techniques, which reinforce concepts.
• SchoolTube — SchoolTube is a video sharing platform for K-12 students and their educators, with registered users representing over 50,000 schools and a site offering of over half a million videos.
• Instructables — Instructables is a hybrid learning site, offering free online text and video how-to instructions for mostly physical DIY (do-it-yourself) projects that cover various hands-on crafts, technology, recipes, game play accessories and more. (Costs lie in project materials only.)
• creativeLIVE — CreativeLive has an interesting approach to workshops on creative and lifestyle topics (photography, art, music, design, people skills, entreprenurship, etc.), with live access typically offered free and on-demand access requiring purchase.
• Do It Yourself — Do It Yourself (DIY) focuses on how-tos primarily for home improvement, with the occasional tips on lifestyle and crafts topics.
• Adafruit Learning System — If you’re hooked by the Maker movement and want to learn how to make Arduino-based electronic gadgets, check out the free tutorials at Adafruit Learn site — and buy the necessary electronics kits and supplies from the main site.
• Grovo — If you need to learn how to efficiently use a variety of Web applications for work, Grovo has paid (subscription, with free intros) video tutorials on best practices for hundreds of Web sites.

General College and University

Flvs Online School

• edX — The edX site offers free subject matter from top universities, colleges and schools from around the world, including MIT and Harvard, and many courses are “verified,” offering a certificate of completion for a nominal minimum fee.
• Cousera — Coursera is a learning site offering courses (free for audit) from over 100 partners — top universities from over 20 countries, as well as non-university partners — with verified certificates as a paid option, plus specializations, which group related courses together in a recommended sequence.
• MIT Open Courseware — MIT OpenCourseWare is the project that started the OCW / Open Education Consortium [http://www.oeconsortium.org], launching in 2002 with the full content of 50 real MIT courses available online, and later including most of the MIT course curriculum — all for free — with hundreds of higher ed institutions joining in with their own OCW course materials later.
• Open Yale Courses — Open Yale Courses (OYC) are free, open access, non-credit introductory courses recorded in Yale College’s classroom and available online in a number of digital formats.
• Open Learning Initiative — Carnegie Mellon University’s (CMU’s) Open Learning Initiative (OLI) is course content (many open and free) intended for both students who want to learn and teachers/ institutions requiring teaching materials.
• Khan Academy — Khan Academy is one of the early online learning sites, offering free learning resources for all ages on many subjects, and free tools for teachers and parents to monitor progress and coach students.
• MIT Video — MITVideo offers over 12,000 talks/ lecture videos in over 100 channels that include math, architecture and planning, arts, chemistry, biological engineering, robotics, humanities and social sciences, physics and more.
• Stanford Online — Stanford Online is a collection of free courses billed as “for anyone, anywhere, anytime” and which includes a wide array of topics that include human rights, language, writing, economics, statistics, physics, engineering, software, chemistry, and more.
• Harvard Extension School: Open Learning Initiative — Harvard’s OLI (Open Learning Initiative) offers a selection of free video courses (taken from the edX selection) for the general public that covers a range of typical college topics, includings, Arts, History, Math, Statistics, Computer Science, and more.
• Canvas Network — Canvas Network offers mostly free online courses source from numerous colleges and universities, with instructor-led video and text content and certificate options for select programs.
• Quantum Physics Made Relatively Simple — Quantum Physics Made Relatively Simple” is, as the name implies, a set of just three lectures (plus intro) very specifically about Quantum Physics, form three presentations given by theoretical physicist Hans Bethe.
• Open UW — Open UW is the umbrella initiative of several free online learning projects from the University of Washington, offered by their UW Online division, and including Coursera, edX and other channels.
• UC San Diego Podcast Lectures — Podcast USCD, from UC San Diego, is a collection of audio and/or video podcasts of multi-subject university course lectures — some freely available, other only accessible by registered students.
• University of the People — University of the People offers tuition-free online courses, with relatively small fees required only for certified degree programs (exam and processing fees).
• NovoEd — NovoEd claims a range of mostly free “courses from thought leaders and distinguished professors from top universities,” and makes it possible for today’s participants to be tomorrow’s mentors in future courses.

Online Learning Sites

IT and Software Development

Online Learning For Kids

• Udacity — Udacity offers courses with paid certification and nanodegrees — with emphasis on skills desired by tech companies in Silicon Valley — mostly based on a monthly subscription, with access to course materials (print, videos) available for free.
• Apple Developer Site — Apple Developer Center may be very specific in topics for lessons, but it’s a free source of documentation and tutorials for software developers who want to develop apps for iOS Mobile, Mac OS X desktop, and Safari Web apps.
• Google Code — As with Apple Developer Center, Google Code is topic-narrow but a good source of documentation and tutorials for Android app development.
• Code.org — Code.org is the home of the “Hour of Code” campaign, which is aimed at teachers and educators as well as students of all ages (4-104) who want to teach or learn, respectively, computer programming and do not know where to start.
• Mozilla Developer Network — MDN (Mozilla Developer Network) offers learning resources — including links to offsite guides — and tutorials for Web development in HTML, CSS and JavaScript — whether you’re a beginner or an expert, and even if you’re not using Mozilla’s Firefox Web browser.
• Learnable — Learnable by Sitepoint offers paid subscription access to an ebook library of content for computers and tablets, and nearly 5,000 videos lessons (and associated code samples) covering software-related topics – with quizzes and certification available.
• Pluralsight — Pluralsight (previously PeepCode) offers paid tech and creative training content (over 3,700 courses and 130K video clips) for individuals, businesses and institutions that covers IT admin, programming, Web development, data visualization — as well as game design, 3D animation, and video editing through a partnership with Digital-Tutors.com, and additional software coding lessons through Codeschool.com.
• CodeHS — CodeSchool offers software coding lessons (by subscription) for individuals who want to learn at home, or for students learning in a high school teacher-led class.
• Aquent Gymnasium — Gymnasium offers a small but thorough set of free Web-related lesson plans for coding, design and user experience, but filters access by assessing the current knowledge of an enrollee and allows those with scores of at least 70% to continue.