M.L.
A springform pan is a special sort of cake pan. A standard pan is made in one piece (or close to it), as you know. A springform pan is made in two pieces - made so that the side comes completely apart from the bottom, and yet the pan doesn't leak when it's used.
Don't feel dumb. I had to ask the same questions when I came across a springform recipe! I happened to find such a pan at one of the local thrift stores, and found it easy to use.