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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.
Service is singleton and simple version of Factory. While Factory is a simple version of Provider, Factory is a more flexable compared to service method, and a short handed for configuring a service when $get method is required. Provider creates new object by the $get factory function. Provider is not injectable during run phase or run time while all others are ( Constant, Variable, Service, and Factory), however, Provider is injectable during the configuration phase or compile time.