Entity framework self tracking entities vs Unit of work

Chamika Sandamal asked:

What is the difference between using Entity framework self tracking entities and implementing Unit of work architecture? As i understand both are keep tracking of the objects, one db call for commit changes. So i cant figure out the difference of those. can some one point me about what should used in which case?
I'm using entity framework 5 with WCF service application.

Tags: C#, WCF

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