The following ERD illustrates the functionality of various components involved in a hotel management system. It helps visualize the various entities involved and the relationship among the entities. Whether you’re a student, a teacher, or a system designer this diagram will help you in your understanding of the hotel management system.The entities are represented using rectangular shapes, the attributes associated with each of the entities are represented using oval-like shapes, and the relation among the entities is represented using diamond-like shapes. Here a straight line is used to join the entities with one another.