Grand Theft Auto IV Trophies For the ps3?

What are the Trophies use for in the game for?
Answer #1
they are like the achievments on xbox live, not actualy used for anything, just so you can brag that you spent all your time hunting down every last trophy (or something like that)
Answer #2
It gives you a reason to complete the game 2~5 Time’s.
And you can brag about’em also.