What is the difference between solidworks floxpress and flow simulation?

Guys, I started out a search to learn how to do CFD analysis using SOLIDWORKS 2015. Then i came across floxpress. Therefore as I am new to flow simulations, do tell me which is efficient and produces better result.

I also have another question. Then I came across "fluid flow and cfd" separately. My assumption that both were same was shattered at an instant. I am confused now. So if you know what I am talking about then do share your thoughts constructively.

Thanks

SolidworksSimulation