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A synchronous task is a task whose execution blocks the current thread until it completes. Until the synchronous task is finished, the main thread cannot continue.

Examples of usage in iOS development:

• Reading a file from disk on the main thread.
• Performing a network request using URLSession.shared.dataTask(with:url) without using a completion handler on another thread.

Consequences of using synchronous tasks on the main thread:

• The UI becomes unresponsive ("freezes").
• A watchdog timer may trigger, and the app may crash if the task takes too long.

For performing potentially long operations, it is better to use asynchronous tasks to avoid blocking the main thread and to maintain app responsiveness.