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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.
The difference between a dynamic and a static GC is as follows: A Global Collections is considered as dynamic, if you use a search criteria to define the members of the GC. That means a model is automatically added to the GC, if it meets its search criteria. So you do not manually add a model into the GC.