What is a domain model

I read the domain model definition on wikipedia. I still don't get it. I read a lot of posts for NHibernate and in almost every published letter I see the term Domain Model. That this is exactly the case, and anyone has an example of a domain model.

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Basically, this is a “model” of the objects needed for your business purposes.

Suppose you made a sales tracking site - you would potentially have classes like Customer, Vendor, Transaction, etc. All entire classes, as well as the relationships between them, will contain your Domain Model .

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Thus, the domain model is a selective and structured representation of domain knowledge relevant for a given software development project.

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