# Entity-Relationship (ER) Model Entity-Relationship (ER) Model * Entity-relationship model is a model used for design and representation of relationships between data. * Entity and Entity Set * Attributes * Keys * Relationships ## Entity * A real-world object which has characteristics and holds relationships in a DBMS. ## Entity Set * The complete datasets of an Entity is the Entity Set. ## Weak Entity * An entity that depends on another entity called a weak entity. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://mun.gitbook.io/dbms/database/relational-database-management-system-rdbms/entity-relationship-er-model.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.