# Data Structure Diagram

## What is a Data Structure Diagram?

A **data structure diagram (DSD)** is a type of diagram that represents the relationships and organization of data within a system. It is used to visually model and communicate the design of a data structure.

There are several different types of DSDs, including:

- Entity-Relationship diagrams (ERD): These diagrams model the relationships between different entities in a system, such as tables in a database. They use symbols such as rectangles to represent entities, and lines with arrowheads to represent relationships.
- Class diagrams: These diagrams model the classes and objects in an object-oriented system, and the relationships between them. They use symbols such as rectangles to represent classes, and lines with arrowheads to represent relationships.
- Data flow diagrams (DFD): These diagrams model the flow of data through a system, and the processes and data stores involved in that flow. They use symbols such as circles to represent processes, rectangles to represent data stores, and arrows to represent the flow of data.
- Object diagrams: These diagrams model the instances of classes and the relationships between them. They use symbols similar to class diagrams but with specific values for each instance.
- Data Dictionary diagrams: These diagrams model the data elements and their relationships in a system. They use symbols such as rectangles to represent data elements, and lines with arrowheads to represent relationships.

A DSD can be used to communicate the data structure design to developers, stakeholders, and other members of the team. It can also be used as a blueprint for the implementation of the data structure in the system.