MERN Stack Interview Question & Answer Day - 3 #shorts

Answer :
The Event Loop is a mechanism that allows JavaScript to handle asynchronous tasks even though it runs on a single thread.
JavaScript executes code using a Call Stack. When it encounters tasks like setTimeout, API calls, or user events, these tasks are handled separately by the browser or Node.js environment so they don’t block the main thread.Once these tasks are completed, their callbacks are placed in a queue. The Event Loop keeps checking if the Call Stack is empty, and when it is, it moves the callback from the queue to the Call Stack for execution.
This process allows JavaScript to run smoothly without waiting for long tasks to finish.

Estimated speaking time: 20–25 seconds
Key points interviewers expect:
Single-Threaded Nature
Non-Blocking Mechanism
Web APIs/Node.js Delegation
Callback Queue Placement
Continuous Monitoring
Safe Execution Transfer

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