PS2 - Jaggies?

Hey, i've recently been playing Kingdom Hearts 2 and Kingdom Hearts 2 Final Mix, and i have come to notice that i have an incredible amount of jaggies on my game, i've seen screenshots and videos of people filming their gameplay with 0 jaggies, even on a new HDTV. What gives?

We need alot of info...-Emulator or ps2?-Copied or official game?-What tv you have?-And what on earth is a jaggy?