Distance in time and/or space between the learner and the facilitator

Two words that are essential to understand in the distance learning world are:

Synchronous = Same Time.  This applies to chats, webinars, phone and other same-time communications methods.

Asynchronous = not same time. This applies to email, Learning Management Systems (LMS), and other "when you get to it" communication methods.

The most common form of distance learning is "online learning." In this format learners access learning materials, written or recorded lectures, and perform activities through a web-based system. Most LMS features are asynchronous, so they appeal to the learner who works, has children, or has committments during the standard work day.

Other forms of distance learning include web conferencing and video conferencing, which are synchronous.  The benefit of this environment is the ability to ask and answer questions immediately, to explain complex concepts, and to get immediate feedback. 

Other types of distance learning include correspondence, email, CDs and podcasting.  Current strides are being taken to teach strictly thorugh social networking. The world is changing, but as long as there is communication, learning can take place.