Let me just share what wikipedia told about e-learning

Electronic learning or E-learning is a general term used to refer to computer-enhanced learning. It is used interchangeably in so many contexts that it is critical to be clear what one means when one speaks of 'eLearning'. In many respects, it is commonly associated with the field of advanced learning technology (ALT), which deals with both the technologies and associated methodologies in learning using networked and/or multimedia technologies.

The worldwide e-learning industry is estimated to be worth over 38 billion euros according to conservative estimates, although in the European Union only about 20% of e-learning products are produced within the common market. Developments in Internet and multimedia technologies are the basic enabler of e-learning, with content, technologies and services being identified as the three key sectors of the e-learning industry [1], although it can be seen that there are two additional sectors, those being the consulting and support sectors.

There are many organisations in this market, including companies such as SkillSoft, Knowledge Anywhere, Epic, LearnKey, Semanoor, BlueU and LearningSteps.com are leading innovators in the design and development of e-learning in the commercial world. SkillSoft is by far the largest company in the global market since their 2006 acquisition of Thomson NETg[citation needed], whilst Epic is one of the largest bespoke e-learning content providers.