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UML Diagram Examples and Templates

Browse class, sequence, activity, and use case diagram examples with PlantUML steps. Open any example in the free UML diagram tool, or read the tutorials.

Diagram types

UML Class Diagram example

A structural diagram that shows the classes, attributes, operations, and relationships in a system.

Keywords:

Use Cases:

System Design and Architecture, Object-Oriented Design, Database Schema Design, API Documentation, Code Generation, System Documentation, Reverse Engineering

Industries:

Software Development, Enterprise Applications, Web Development, Mobile Application Development, Game Development, Financial Systems, Healthcare Systems, E-commerce Platforms

UML Sequence Diagram example

Sequence Diagram

A behavioral UML diagram that shows how objects exchange messages over time.

Keywords:

Use Cases:

API request and response flows, Microservice collaboration, Authentication sequences, Checkout and payment flows

Industries:

Software Development, Web Development, Enterprise Applications, E-commerce Platforms

UML Activity Diagram example

Activity Diagram

A UML workflow diagram for business processes, decisions, and parallel work.

Keywords:

Use Cases:

Business process modeling, Onboarding flows, Order fulfillment, Document approval

Industries:

Software Development, Operations, E-commerce Platforms, Enterprise Applications

UML Use Case Diagram example

Use Case Diagram

A UML diagram of actors and the system functions they use.

Keywords:

System Boundary

Use Cases:

Product scoping, Requirements kickoff, Stakeholder workshops, Feature inventory

Industries:

Software Development, Product Management, Enterprise Applications, Education