E-learning is an all-encompassing term generally used to refer to computer-enhanced learning, although it is often extended to include the use of mobile technologies such as PDAs and MP3 players. It may include the use of web-based teaching materials and hypermedia in general, multimedia CD-ROMs or web sites, discussion boards, collaborative software, e-mail, blogs, wikis, computer aided assessment, educational animation, simulations, games, learning management software, electronic voting systems and more, with possibly a combination of different methods being used.
Advantages of e-learning often include flexibility and convenience for the learner especially if they have other commitments, facilitation of communication between learners, greater adaptability to a learner's needs, more variety in learning experience with the use of multimedia and the non-verbal presentation of teaching material.
Others are critical of e-learning in the context of education, because the face-to-face human interaction with a teacher has been removed from the process, and thus, some argue, the process is no longer "educational" in the highest philosophical sense (for example, as defined by RS Peters, a philosopher of education). However, these human interactions can be encouraged through audio or video-based web-conferencing programs.
The feeling of isolation experienced by distance learning students is also often cited, although discussion forums and other computer-based communication can in fact help ameliorate this and in particular can often encourage students to meet face-to-face and form self-help groups.
The cost-effectiveness of e-learning is a subject of much debate as there is usually much upfront investment that can only be recouped through economies of scale. Web and software development in particular can be expensive as can systems specifically geared for e-learning. The development of adaptive materials is also much more time-consuming that that of non-adaptive ones. It is possible that the best-placed organisations to be successful in the e-learning marketplace are likely to be those in the games and movies industries.