How to differentiate between SAP content and Partner Content in Repository.?

Hello all,

I am new to SAP and trying to learn SAP byDesign.

I created my first test solution by looking at the learning video and I got some doubts

The repository of SAP byDesign contains "SAP content" and "Partner content".

So in SAP solution onDemand Studio, using repository explorer i can see the content but could not able to differentiate "SAP content" and "Partner Content".

Can any tell me how to differntiate "SAP Content" and "Partner content".

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Our client has some product to sell. My task is to retrive the product using productID and other parameters related to productId. But i dont know in which Business object to use to retrive the product information.

So can any one give an idea to proceed.?

Thanks in advance