In software engineering, a class diagram in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among the classes.
A relationship is a general term covering the specific types of logical connections found on class and object diagrams.
UML shows the following relationships:
- Instance level relationships
- Class level relationships
- General relationship
1) Instance Level Relationships
a. Association
b. Aggregation
c. Composition
2) Class Level Relationships
a. Generalization
b. Realization
3) General Relationships
a. Dependency
b. Multiplicity
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