- Behavioral and structural
- UML was originally created to visually document object-oriented systems
- Activity diagram, interaction diagram, state machine diagram, and use-case diagram
- Activity diagrams illustrate the flow of processes in a system
- Use-case diagrams document the interactions between users and the system
- Actors are a system's users
- Structural diagrams illustrate components of a system
- Class diagram
- The composite structure UML diagram shows the runtime structure of a system
- The deployment diagram provides a visual representation of a system's hardware and software
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