What is the function of onDestroy in Unity?

In Unity, the OnDestroy() method is a method of the MonoBehaviour class, used to perform some clean-up work before a game object is destroyed. Specifically, when the OnDestroy() method is called, it indicates that the game object is about to be destroyed. At this point, you can release resources, unsubscribe from events, close open files, etc. to prevent resource leaks and unhandled situations. Some common use cases include unsubscribing from events, removing references, destroying created objects, closing open files, stopping running coroutines, releasing allocated memory, etc. In short, the OnDestroy() method can be used to perform necessary clean-up operations before an object is destroyed to ensure the stability and performance of the game.