What is Callback in JavaScript | JavaScript Tutorials in Hindi | Interview Question #24

In JavaScript, a callback is a function that is passed as an argument to another function and is executed when the first function is completed. The main purpose of a callback is to allow asynchronous operations, where the completion of a task may take some time and it would be inefficient to wait for it to finish before moving on to the next task.

Callbacks are commonly used in JavaScript for handling events, making HTTP requests, and other asynchronous operations. They are an important part of JavaScript programming and are used extensively in modern web development.