what is use case diagram?

Can you tell me what a use case diagram? Business Analyst Interview

Ans: First of all a use case diagram is a part of UML and it is a behavioral digram which is created from a use case analysis. The main reason or use of this use case diagram is it defines the functions of the module or system and the role of each actor associated to that function.

For Eg: "Order Management" is a main function, and the person who receives the order in the office is an actor.

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