A callback is a function that is passed as an argument to another function and is executed after its parent function has completed.
Callbacks are commonly used in JavaScript for asynchronous programming, where they allow you to perform tasks after a certain operation has finished, such as fetching data from a server.
Callbacks can be used to handle events, manage asynchronous tasks, and create reusable code.
One of the main advantages of callbacks is their ability to handle asynchronous operations without blocking the main thread.
However, callbacks can also lead to callback hell, where nested callbacks become difficult to manage and read.
To avoid callback hell, developers often use promises or async/await, which provide cleaner syntax for handling asynchronous operations.