Answer
Node uses one main thread to execute JavaScript while delegating heavy tasks to background workers.
Quick Answer
Single-threaded means Node.js runs JavaScript on one main thread — unlike traditional servers that create a new thread per request. Instead of threading, Node uses asynchronous callbacks to handle concurrency. The single thread is never blocked because I/O operations run in the background (via libuv) and notify the main thread when done.
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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