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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.
Because all of the members belong to the class (instead of object of the class), and class declarations usually have global scope, a pure static class is essentially the equivalent of declaring functions and global variables in a globally accessible namespace, with all the requisite downsides that global variables have.