Difference between synchronous and asynchronous updates, Computer Engineering

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What is the difference between Synchronous and Asynchronous updates?

A program asks the system to perform a particular task, and then either waits or doesn't wait for the task to finish. In synchronous processing, the program waits: control returns to the program only when the task has been finished. In asynchronous processing, the program does not wait: the system returns control after merely logging the request for implementation.

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