Answer
Node uses the event loop and worker threads behind the scenes. The main thread handles requests while heavy operations run in worker threads.
Quick Answer
Node.js is single-threaded for JavaScript, but libuv (its async I/O library) uses a thread pool for blocking operations like file system and DNS. The event loop delegates I/O to libuv, stays free to handle other events, and picks up the callback when libuv finishes. So concurrency is achieved through async I/O, not multiple threads.
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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