Web Reference: Mar 3, 2026 · In Node.js, callbacks enable asynchronous, non-blocking execution, while methods like readFileSync () perform blocking operations. The fs module provides both synchronous and asynchronous approaches to handle file system tasks. The callback is used to define what happens when the function containing the callback as an argument completes its execution. For example, we can define a callback to print the error and result after the function execution. A callback is a simple function that's passed as a value to another function, and will only be executed when the event happens. We can do this because JavaScript has first-class functions, which can be assigned to variables and passed around to other functions (called higher-order functions)
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