An entity relationship model ERM is known as an abstract & conceptual representation of data flow. Entity-relationship modeling is a method of database modeling, which is used to produce a type of conceptual schema and semantic data model of a system, usually for a relational database, and its requirements flows in a top-down fashion. The whole processes diagram is called entity-relationship diagrams, ERDs or ER diagrams.

There are considered three types of relationships between entities:

• One-to-one: In one to one relationship one instance of an entity A is associated with one instance of another entity B. Example, database of staff members or employees, each staff member name A is associated with one social security number B, not more than one.

• One-to-many: In this relationship one instance of an entity A is related or associated with zero, one or many instances of other entity B, but for one instance of entity B it is only one instance of entity A. E.x, for a company, all employees working in one single building, the building name A is related or associated with all different employees B, but all employees share the same singular association with entity A.

• Many-to-many: In this relationship, one instance of an entity A is related or associated with one, zero or may be many instances of other entity B, and one instance of entity B is associated or related with one, zero or many instances of entity A. E.x, for a company, where all employees work on so many projects, each instance of an employee A is related or associated with many instances of a project B, and at same time, each instance of project B has multiple employees A relation or associated with it.

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