Node.js · Buffers · Fresh / Intern · Concept
What is a Buffer in Node.js?
Short Interview Answer
A fixed-length sequence of bytes for binary data, backed by outside-V8 memory (historically) / ArrayBuffer views.
Detailed Explanation
Used for file, network, and crypto data. Encoding matters when converting to/from strings. Never treat untrusted Buffers as UTF-8 blindly without validation.