`return 0;` decides the return code for the application.
In this case, 0 means *`OK`* and 1 means *`ERROR`*.
If the application doesn't return, you will likely get an error.

In most cases, the compiler will know that the function is supposed to return an `int` and include it anyway, meaning including `return 0;` isn't necessary.
Although it isn't necessary, it is better practice. Not having `return 0;` could cause issues in the future.

Let me know if there's anything else you want me to assist you with! 😊
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