Use case diagrams

Use case diagrams illustrate how users (actors) interact with a system. They help define system scope and identify key functionalities by mapping out high-level user interactions. They are ideal for stakeholder discussions and early-stage planning.

Class diagrams

Class diagrams show the static structure of a system, including classes, attributes, methods, and relationships between objects. They are commonly used for object-oriented modeling and understanding system architecture.

Sequence diagrams

Sequence diagrams depict how objects communicate with each other in a time sequence. They're useful for showing the order of operations and message flow during a specific interaction or process.

Activity diagrams

Activity diagrams represent workflows, business processes, or system activities. Similar to flowcharts, activity diagrams are useful for modeling conditional logic, concurrent flows, and decision points.

State machine diagrams

State machine diagrams model the possible states of an object and its transitions triggered by events. They are useful for designing reactive systems like UI components, embedded systems, or protocol handlers.

Component diagrams

Component diagrams show how larger software components or modules are organized and interact. They are useful for understanding system modularity, service boundaries, and deployment dependencies.

Deployment diagrams

Deployment diagrams illustrate the physical hardware or infrastructure nodes and the software components deployed on them. They are useful for visualizing system topology and environment setup.