Asynchronous Learning - Asynchronous classes let students complete their work on their own time. Students are given a timeframe – it's usually a one-week window – during which they need to connect to their class at least once or twice. The good news is that in asynchronous courses, you could hit the books no matter what hour of day (or night).
Synchronous Learning - Synchronous learning is when classes occur on set schedules and time frames. Students and instructors are online at the same time in synchronous classes since lectures, discussions, and presentations take place at specific hours. All students must be online at that exact time in order to participate in the class.