UML class diagram graphically displays the classes in the system, their relationships, and the internal structure of the classes. These diagrams not only help developers understand the overall architecture of the system, but also promote communication and collaboration in teamwork, ensuring that all members have a common understanding of the design. This article will explain the concepts, rules, and drawing methods of class diagrams in detail, and share a large number of cases.

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Use case diagram refers to a view used to describe system functions consisting of actors (Actors), use cases (Use Case), boundaries and the relationships between them. It is a model diagram of the system's functionality as observable to external users (called actors). The purpose of a use case diagram is to capture the dynamic aspects of a system. It is used to collect the system's requirements, including internal and external influences, which are mostly design requirements.

UML package diagram is usually used to describe the logical architecture of the system - layers, subsystems, packages, etc. It is a combination of basic static diagrams and is a static diagram.