Concept of Callback Functions in Node.js

In Node.js, callback functions are used to handle asynchronous operations. Asynchronous operations in Node.js do not block the execution of the program, allowing it to continue running while waiting for a response. When the asynchronous operation is completed, the callback function is called to handle the result.

Callback functions in Node.js are passed as arguments to asynchronous functions. They are executed once the asynchronous operation is complete, allowing you to perform further actions based on the result.

By using callback functions, you can ensure that your code remains non-blocking and responsive, making it ideal for handling I/O operations such as reading files, making network requests, and interacting with databases.

Overall, callback functions in Node.js provide a powerful way to work with asynchronous operations and handle the flow of the program effectively.