Unified Modeling Language (UML) description, UML diagram examples, tutorials and reference for all types of UML diagrams - use case diagrams, class, package, component, composite structure diagrams, deployments, activities, interactions, profiles, etc.. The Unified Modeling Language (UML) is a standard visual modeling language to document business processes and software architecture using several types of diagrams - use case diagrams, class, package, component, composite structure diagrams, deployments, activities, interactions and profiles. The site provides graphical notation reference and examples of all types of UML diagrams.. UML 2, 2.2, 2.3, 2.4, 2.5, diagrams, examples.