Answer
Cluster creates multiple Node processes to use all CPU cores, improving performance.
Quick Answer
The cluster module lets you create multiple Node.js worker processes that all share the same server port. Since Node.js is single-threaded, cluster spawns one worker per CPU core — each worker handles its own event loop. The master process distributes incoming connections across workers. This is how Node.js uses all CPU cores.
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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