Synchronous learning takes place when two or more people are communicating in real time. Sitting in a classroom, talking on the telephone, chatting via instant messaging are examples of synchronous communication. So is sitting in a classroom a world away from where the teacher is speaking via teleconferencing. Think "live." Asynchronous learning, on the other hand, is thought to be more flexible. The teaching takes place at one time and is preserved for the learner to participate in whenever the time is most convenient for him or her. Technology such as email, ecourses, online forums, audio and video recordings make this possible. Even snail mail would be considered asynchronous. Fancy word for convenience. I prefer Synchronous learning.