E-learning, Web-based learning, online learning, and distance learning are widel

E-learning, Web-based learning, online learning, and distance learning are widely used as interchangeable terms. However, these terms represent concepts with subtle, yet consequential differences. A clear understanding of these concepts and their fundamental differences is important for both the educational and training communities.
Provide a sufficient definition for each of the above terms. (DO NOT USE BULLETS)
For each of these concepts, the discriminating feature must be the primary characteristic of the learning activity. Intensive use of the feature is required, since incidental or occasional use of a characteristic feature is not sufficient to qualify for a certain type of learning.
Provide an example of how you would use each of these techniques.