# Introduction to Entity Relationship Diagrams
Entity Relationship Diagrams (ERDs) are a fundamental part of database design and architecture. They provide a visual representation of the data and how entities within a database relate to each other. Using ERDs can make it much easier to grasp the structure of a database without having to examine each table individually. In this section you will learn to read these diagrams, understand the relationships between tables, and apply this knowledge to create and query tables.
# Lessons
- SQL - W5 Introduction to Entity Relationship Diagrams
- Next: SQL - W5 Entity Relationship Diagram Structure
- SQL - W5 Representing Relationships
- SQL - W5 Data Types and Nullability
- SQL - W5 Querying from ERDs
- SQL - W5 Entity Relationship Diagrams Practice Assignment