Event Loop in Node.js is a architectural model that handles multiple concurrent clients efficiently. It allows Node.js to handle thousands of concurrent connections with a single server instead of creating a separate thread for each connection.
The Event Loop handles all async callbacks in Node.js applications. Every time an async function is called, it is registered with the Event Loop. Then, when the async operation is complete (like when a timer expires or a server has returned with data), the callback function associated with that async operation is moved to a queue known as the Call Stack. The Event Loop constantly checks the Call Stack, and when it is empty, it takes the first item from the callback queue and pushes it onto the Call Stack, which is then executed.
This constant checking of the Call Stack is known as looping. The process continues until the callback queue is empty, then event loop allows the process to exit.
