Okay, I understand it is like a search engine and if I click the "File Name" tab I will get files that have that name in them, but when I click on the "Contents" tab I get things like my wallpapers, which do not have the term I searched for in the file name. My question is why is this? In fact, I searched the same term just now and I got different wallpapers and images than the last time.
If you're not sure what I mean, open a Finder window, and search for something on the top right corner of the window.