Entity-Relationship (ER) diagrams are fundamental tools for designing databases. They help visualize data structures and relationships.

Core Concepts

• Entities: Objects that store data (e.g., User, Order)
• Attributes: Properties of entities (e.g., name, email)
• Relationships: Connections between entities
• Keys: Unique identifiers (primary, foreign)

Benefits of ER Diagrams

ER diagrams help database designers communicate, identify requirements, and create efficient database structures before implementation.