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Main execution thread (main thread) in iOS typically performs operations related to updating the user interface (UI). This includes:

• Rendering and updating interface elements.
• Handling user events (taps, gestures).
• Calling methods of UIKit and other UI frameworks.

It is important not to block the main thread with long-running operations (such as network requests or heavy computations) so that the interface remains responsive. For such tasks, background threads or queues are used.