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Use case diagrams and activity diagrams are behavioral UML diagrams that describe the dynamic characteristics of a system. The difference between use case diagrams and activity diagrams is that use case diagrams help to model the system, user interactions, while activity diagrams help to model the workflow of the system and are often used to illustrate the internal logic of use cases. These diagrams offer multiple advantages. They help model business requirements and understand the functionality of the system at a high level.

UML can be used as much or as little as you like. Martin Fowler describes three common ways that people tend to use UML: (1) UML as a sketch ; (2) UML as a blueprint ; (3) UML as a programming language.

A state machine diagram is a behavior which specifies the sequence of states an object visits during its lifetime in response to events, together with its responses to those events.

Use cases describe how users use the system to achieve specific goals. A use-case diagram consists of a system, related use cases, and actors, and relates them to each other to visualize: What is it describing? (System), who is using the system? What are the actors trying to achieve? Thus, use cases help ensure that the right system is developed by capturing requirements from the user’s point of view.