Another concept is "DRM free". I know what DRM is (I think ), but I don't get that concept. I see that some Steam games are DRM free, but do you need to connect to Steam to play them as in any other Steam game? If you need to then it isn't DRM free actually, is it?
steam games are never DRM free cause you always need steam to access the game (downloading and playing). basicly its just a virtual gamedisk container :>

and yeah in the beginning steam was one of the nastys copy protections ive seen and it was deeply digging into your system
but its not that bad anymore and is easy to uninstall