Web Reference: May 5, 2009 · A callback function, also known as a higher-order function, is a function that is passed to another function as a parameter, and the callback function is called (or executed) inside the parent function. Feb 2, 2026 · Understand why callback hell happens, how it impacts your code, and the modern techniques, promises, and async/await that make your asynchronous JavaScript readable and maintainable. Jul 23, 2025 · The term "callback hell" describes the deep nesting of functions that can result in poor code readability and difficulty in debugging, especially when handling multiple asynchronous operations.
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