Are js and C-sharp using the async/await method for the opposite purpose?

node has its own asynchronous feature. Does async/await execute code in a Synchronize way?
while C-sharp comes with Synchronize feature, is async/await designed to execute code asynchronously?
is this understood correctly?

Aug.01,2021

actually has the same purpose. C-sharp async await simplifies multithreaded programming.

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