A disto is a version of Linux. For instance, I have Damn Small Linux which is good for old computers (really slow ones, Win 95-98), ELive, which is what I have on my laptop, Ubuntu (currently the top version) which would be better for newer computers (anything that can run Windoze XP).
Or if you go to (
[link]) (bookmarking is a good idea,) and search around.