Answer
Synchronous: Blocks the calling thread until completion.
Asynchronous: Frees the thread and allows other operations to run concurrently.
Async-await uses Tasks and compiler-generated state machines.
Quick Answer
Sync blocks the current thread until completion — simple but wasteful for I/O bound work. Async with await frees the thread during the wait using compiler-generated state machines. On web servers, async means one thread can handle many concurrent requests instead of sitting idle.
S
SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ