3 definitions of e-learning

What is e-learning?
The 3 definitions of e-learning are:

1.)it seems to be used for web-based and distance education, which may also involve face-to-face interaction

Common Characteristics(1): web-based

2.)it may include all types of technology- enhanced learning(TEL), where technology is used to support the learning process

Common Characteristics(2): TEL

3.)it is often used interchangeably with various other related terms, such as distance learning, distributed learning and electronic learning

Common Characteristics(3): electronic learning, distance learning, distributed learning. http://en.wikipedia.org/wiki/E-Learning