Many eLearning vendors use the terms synchronous and asynchronous when describing their offering. What is the difference between asynchronous and synchronous learning anyway?

Synchronous means that an instructor is present when the course is delivered, even though the course might be delivered remotely over the Internet. Web conferencing solutions such as Webex or GoToMeeting are synchronous.

Asynchronous means that the instructor does not need to be present, thereby allowing students to learn anytime, at their convenience. Solutions that allow you to deliver pre-recorded courses such as Dual Code's Corporate University is asynchronous.