Databases?

[Atomic_Sheep]

Hi, I've had limited database experience so my knowledge is rather limited. I was wondering whether it's possible to create a database which I would obviously use in my program that wouldn't require the user to install additional software packages for e.g. MS Access or the like and that I could use simply as a resource file in my project and for it to be recognised? I see that Qt has some SQL classes, but I'm not sure whether that would require the user to install some sort of SQL addon? I can obviously use a .txt document for this purpose but I was wondering whether there are other options? Possibly ones that users won't be able to open or if they do, they will just get gobbledygook.

Oh forgot to mention, I'm not 100% sure at the moment, but my database won't that big and the plan is to be able to load the whole of it into memory upon starting my application, so that's another consideration that I have.