Which type of diagram helps visualize data entities and relationships?

The Entity-Relationship Diagram (ERD) is specifically designed to visualize data entities and their relationships within a database system. This type of diagram offers a clear and structured representation of how different data entities interact with one another, detailing attributes and types of relationships — such as one-to-many or many-to-many. ERDs serve as a foundational tool in database design, simplifying complex data structures and facilitating easier communication among stakeholders regarding data models.

In contrast, flowcharts illustrate processes and workflows rather than data structures. They are useful for understanding the sequence of steps in a process but do not convey information about data relationships. Class diagrams, which are part of object-oriented modeling, focus on the structure of classes in software design rather than directly mapping data entities and their interactions. Use case diagrams depict interactions between users and systems, highlighting functional requirements rather than the underlying data architecture. Therefore, the choice of the Entity-Relationship Diagram aligns most directly with the goal of visualizing data entities and their interrelations.