Entity-Relationship Diagram Components

This diagram illustrates the fundamental components used in Entity-Relationship (ER) modeling, a powerful technique for database design.

Key elements include:

• Entities: Represented by rectangles, these are the core objects or concepts (e.g., Customer, Product, Order).
• Attributes: Listed inside entity rectangles, these are properties describing the entity (e.g., CustomerName, ProductPrice).
• Relationships: Shown as diamonds, they connect entities and describe how they interact (e.g., "places", "contains").
• Cardinality: Notations (like crows-foot or numbers) on relationship lines indicating the number of instances that can be related (e.g., one-to-one, one-to-many, many-to-many).

Understanding these components is crucial for designing efficient and well-structured databases.