Models in the Unified Modeling Language (UML) depict systems at various degrees of detail. Some models represent a system at a higher, more abstract level, while others go into more detail. UML models include model elements such as actors, use cases, classes, and packages, as well as one or more diagrams that depict a specific view of a system. Other, more detailed models can be included in a model. Likewise, the related diagrams and profiles are presented in the Diagrams and Profiles folders.