There's not much difference in what it is and how it works other than the one huge, glaring notable difference in stability in the source code. Windows is a plague which invites other plagues; the Apple OS isn't. At some point, Apple will be a large enough corporation to be considered Evil and it will become a plague also. Attacks on it's code will increase exponentially. As for it's software, meh... it's okay. I don't use iPhoto or iAnything if I can avoid it. However, the whole reason I bought a Mac was to use EMagic's Logic pro audio software, which is a Mac-only application. For me, totally worth it because I DESPISE Cubase, ProTools and all it's derivitives.