Explain the concept of Run Loop and how it is used in applications

Run Loop — is an event processing loop that constantly runs in iOS and macOS applications. It waits for events (such as touches, timers, network requests), processes them, and then returns to waiting.

Run Loop allows the application to remain responsive, not blocking the main thread, and efficiently manage resources.

In iOS, the main Run Loop is automatically started on the main thread and handles user interface events, timers, input events, and other sources.

Example of usage: if you need to perform a task with a delay, you can add a timer to the Run Loop, which will call the handler after the specified time.

Run Loop consists of:

• Event sources (input sources)
• Timers
• Handlers

This is a fundamental part of the architecture of iOS applications for handling asynchronous events.