What is a model.cs file?

Sep 29 2010 1:57 AM

What is a model.cs file?
[IMG]http://i67.photobucket.com/albums/h292/Athono/microsoft/model.png[/IMG]
This appears in a project I am sharing with other dev's. What is a model.cs file?

I have heard that it looks like the MVVM design pattern. Will MVVM design pattern produce this sort of configuration in the IDE where you have a xaml file with two nested cs files like this?