"Data models are tools used in analysis to describe the data requirements and assumptions in the system from a top-down perspective. They also set the stage for the design of databases later on in the SDLC.There are three basic elements in ER models: Entities are the ""things"" about which we seek information. Attributes are the data we collect about the entities. Relationships provide
. the structure needed to draw information from multiple entities.Go here so you can see how it really looks like ""http://www.umsl.edu/~sauterv/analysis/er/er_intro.html"""
