partition !?!?


hmm, i am kinda new too al that os x thing ...
now i tryed too instal x on a computer in our house ...
but i think i destroyed the computer ...
however, all ya guys are talkin about "partition"... :confused:
i think that is a kind like splitting uo the HD .. right ? :(
if yes .. how do i do that ?? is there a tool for that ?? do i need to just make two folders ??
and if no : what is partition ????
i hope you can help me with my problem ...
thnxx ! :confused: