An ER diagram (Entity-Relationship diagram) is a type of diagram that consists of object types and relationships. An object type is a category of objects that share common attributes and behaviors, such as a class, an entity, or a component. A relationship is a connection or association between two or more object types, such as an inheritance, an aggregation, or a dependency. An ER diagram is used to model the structure and semantics of a system, such as a database, a software system, or a business domain. An ER diagram can show the cardinality, optionality, and constraints of the relationships, as well as the attributes and operations of the object types. References: What is an Entity Relationship Diagram (ERD)?, Object Diagrams | Unified Modeling Language (UML), The Easy Guide to UML Class Diagrams | Class Diagram Tutorial, Class diagrams vs Object diagrams in UML
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