text=A class diagram is a UML diagram that models the static structure of a system, which contains classifiers and their relationships to each other. A class diagram can depict some or all of the classes in a model. Conversely, a single model can support many class diagrams and a single classifier can appear in more than one diagram.
Class diagrams typically contain classes that represent the abstraction of a concept. They also contain other classifiers such as interfaces, signals, and enumerations. Class diagrams also use multiple variations of association relationships to indicate which classifiers need to share data with other classifiers. You can also use other relationships on class diagrams such as generalizations, realizations, and dependencies.