What is Object Relational Mapping C#

I am looking at new project in C#.

Can someone explain the following concepts/terms for me.
1.Object Relational Mapping (ORM)  
2.Entity Framework
3. Hibernate
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käµfm³d 👽Commented:
An ORM is a tool that you use to model a database as objects (i.e. classes) within your code, often times including its programmability (i.e. stored procs/functions) as well.

EF is considered by many to be an ORM, but there are some who think otherwise.

NHibernate is an ORM.

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IdaracAuthor Commented:
Thank you.

How do I get started using EF is that something that comes with VS or do I have to install it?
IdaracAuthor Commented:
Thank you
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