ER Diagrame is stands for tEntity Relationship Diagrams , It is the bassically a major data modelling tool . A type of diagram used in data modeling for relational data bases. These diagrams show the structure of each table and the links between tables. and It will also help organize the data in our project into entities and define the relationships between the entities. This process has proved to enable the analyst to produce a good database structure so that the data can be stored and retrieved in a most efficient manner. An entity-relationship (ER) diagram is a specialized graphic that illustrates the interrelationships between entities in a database.