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Difference between Abstract Class,Co Class and Class in ArcObject.

Difference between Abstract Class,Co Class and Class in ArcObject Context.

Abstract classes—Abstract classes cannot be used to create objects.These are a specification for subclasses through type inheritance.

For example, A "line" can be an abstract class for "primary line" and "secondary line" classes. Abstract classes are important for developers who want to create their own subclass (they show which interfaces are required and which are optional for the type of class they are implementing). Required interfaces must be implemented on any subclass of the abstract class to ensure the new class behaves correctly in the ArcObjects system.

Coclasses—Coclasses represent objects that you can directly create using the object declaration syntax in your development environment.
Classes—Classes cannot directly create objects, but objects of a class can be created as a property of another class or instantiated by objects from another class.