Answer
A buffer stores binary data in memory, useful for streams, files, and network operations.
Quick Answer
A Buffer is a fixed-size chunk of raw binary data — like a byte array. Node.js uses Buffers when dealing with binary data: reading files, receiving network packets, processing images. Buffers exist outside the V8 heap and are necessary because JavaScript strings are UTF-16 encoded and can't efficiently represent raw binary.
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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