How We Block The websites????????

Hii Frnds Everyone ask me that how we block a website..
so when i was work on internet i see the trick to block
websites.. but it requires that you are having admin.
authourity..plz dnt misuse it....here is trick
STEP:-1) go to my computer..
STEP:-2)open the drive where window is install..
STEP:-3)go to windows..
STEP:-4)then system 32..
STEP:-5)then drivers...
STEP:-6)then etc and after that host..
STEP:-6)select notepad..
STEP:-7)in notepad type the following
STEP:-8)(ip address of ur system) local host
              (ip address of ur system) (site u want to block)
and now save it... site is blocked...