Is it possible for the Event Loop to be blocked?

Yes, the Node.js Event Loop can be blocked if long-running synchronous code is executed in the main thread. Since the Event Loop runs in a single thread, any heavy computations or blocking operations (such as synchronous file reads, infinite loops) will halt the processing of asynchronous events, leading to delays and decreased performance.

To avoid blocking the Event Loop, it is recommended to use asynchronous APIs, delegate heavy tasks to separate threads (for example, via worker_threads), or use external services for processing resource-intensive operations.