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They are both blueprints for creating instances which encapsulate fields and the methods which act upon them. Both of them can implement interfaces and can include static members which refer to the class or structure as a whole rather than to a particular instance of it.

However, the similarity ends there. Structures don't support inheritance and are value types rather than reference types i.e. a variable of the structure type contains an actual structure rather than a pointer to where it's stored.