Meaning of "Map To Identifier " while creating an External Content Type

In SharePoint 2010 Desginer, I created an External Content Type that retrieves data from a VIEW in SQL Server. In the wizard, I see "Map To Identifier." What is the purpose of that. I want to understand the meaning of Map To Identifier? Thank you.
Mayank

Hi Mayank,
When we create database-based external content type, we could map the data source element to an identifier of the related external content type as input to the association.
In the Data Source Elements pane on the left side, select the data source element in the list. In the
Properties pane on the right side, select the Map to Identifier check box. In the
Identifier list, select the appropriate identifier.
The database object name is referred to as its identifier. An object identifier is created when the object is defined. The identifier is then used to reference the object.
 http://msdn.microsoft.com/en-IN/library/ms175874.aspx
We map the field of the external content type to the identifier of the external content type.
http://msdn.microsoft.com/en-us/library/office/ee558417(v=office.14).aspx
Regards,
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
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Rebecca Tu
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