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Static Class: A class that only contains static components and no instance components is referred to as a static class. Singleton Class: It is a class which does not allow you to create multiple instances.
A static function is one that can be called on the class itself, as opposed to an instance of the class. For example a non-static would be: This method works on an instance of the class, not the class itself. However you can have a static method that can work without having an instance.