Entity relationship diagrams, or ER diagrams are used to model relationships between data in computer databases. Entity relationship modeling is an important concept within software engineering, to deliver sound database applications. ER diagrams use rectangles, triangles, arrows and lines to illustrate relationships between data elements. Lines are drawn between the entity elements to
. illustrate the dependencies and relationships between the data elements. A web site resource for understanding entity relationship diagrams is http://it.toolbox.com/wiki/index.php/Entity_Relationship_Diagram.
