This ER Diagram of the School Registration System depicts the relationship between departments, students, faculties, instructors, and courses. They are parts of the University system. Because they are interdependent, administrators can use ERDs to store students' data, courses, and teachers. These types of ERDs are widely used by businesses and organizations to keep track of their clients or employees. The user can utilize this ERD as a template to create their own. The concept of Foreign Key is ERD is commonly used to identify a row from the same or another table.