This School Management System ER Diagram depicts the relationship between various elements, such as student and department information, and how they relate to one another. The ERD example demonstrates the relationship between a student, a department, and information about the department head, courses, and more. These types of ERD are also useful in other fields. Administrators can use these ERDs to keep track of their employees, students, or clients. It is an entity-relationship diagram model, and Chen's notation can aid in deciphering the interrelationship between the various elements in the system. The creator of the ERD mentioned above example explained the connection between forum users, topics, replies, and other things.