Answer
A callback is a function passed as an argument to execute after an asynchronous task finishes.
Quick Answer
A callback is a function you pass to another function to be called when an operation finishes. In Node.js: fs.readFile('file.txt', callback) — Node reads the file async and calls your callback when done. Callbacks are the original way to handle async operations before Promises and async/await made it cleaner.
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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