I've heard a lot about pathfinder and until recently I didnt really explore it, but I've read a little about it and I'm interested. I've found a pathfinder core rulebook on sale in town and I'm pretty sure I'm gonna buy it. My main question is, is it very similar to the DnD system or would I be learning a whole new system?

And, of course I'm interested in hearing any comments or pieces of advice on the subject.