Web Reference: A JavaScript callback is a function passed as an argument to another function, which is then executed (or "called back") at a later point in time to complete a specific task. Jan 17, 2026 · A callback function is a function that is passed as an argument to another function and executed later. A function can accept another function as a parameter. Callbacks allow one function to call another at a later time. A callback function can execute after another function has finished. Aug 20, 2025 · A callback is simply a function you pass into another function so it can be called later. While the idea is simple, using callbacks correctly helps you write clearer, more reliable code and prepares you for understanding Promises and async/await.
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