Object relationship mapping shows how different objects or classes of a program are related to each other.
These maps help us to understand the Data that is to be stored or used in a System and allows us to develop ways to convert Data between two different storage types.
For example an object orientated approach might store a person as an object with their properties first name and surname. There could be 0 or more of these person objects.
This Data could also be stored in a table called people in a SQL database with the Data for each person stored in a unique Row in that table.
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