PROGRAMING
Synchronous mean when task execution request has been send u should wait for result. Once task execution have done and result ready, then next request may proceed.
In Asynchronous way multiple task execution request will have send almost same time. There no need for wait.
Suppose u have form where two input field. One for upload video another for image. In ur backend u have two function for handle input filtering and sanitizing. In synchronous way program execution will be delay. Since Second function will wait whether first function execution done or not. To make program faster and efficient Asynchronous is great way.
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