A class diagram is a type of diagram in the Unified Modeling Language (UML) modeling language used to represent the static structure of a software system. This type of diagram focuses on the classes that make up the system, the relationships between them, the attributes of the classes, and the methods that operate on those attributes. A class diagram is a fundamental tool in software engineering and object-oriented design.
Class diagrams are useful for visualizing and communicating the structure of a software system, making it easier to understand how classes are organized and interact with each other. These diagrams are valuable during the design phase of a software development project and serve as an important guide for developers during system implementation.