What is Object Relational Mapper (ORM)

An ORM is an application or system that aids in the conversion of data within a relational database management system (RDBMS) and the object model that is necessary for use within object-oriented programming. The O/RM hydrates the object with the data from the database, or creates the SQL statements that will save the object data into the database.
Examples of ORM products are Hibernate, NHibernate, Entity Framework, and Linq-to-SQL etc.

Source: Exam Ref 70-486- Developing ASP.NET MVC 4 Web Applications

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