Synchronous may also be described as being in the right place at the right time. When you perform a synchronous operation, everything that follows must wait for it to finish before continuing.
Asynchronous, on the other hand, can also mean “out of order.” You can run the following code right immediately while doing something asynchronously, and the asynchronous operation will happen later. It may be run on a different thread from the remainder of the programme. It may simply be rescheduled for a later date on the same topic, and you can be notified when it is completed.