Corny, aka corney, aka cornie kegs are what most people use. Short for cornelius kegs, the name of the company that made them.
There's really not much to it, it's like one big bottle. You have the option of priming or force carbonating, most people seem to force carbonate.
If you google how to keg homebrew you'll find a ton of resources and some videos as well. I'd give you links, but I haven't really looked at any of the sites and don't have a favorite.