What file format do i play a ps2 game on pcsx20.9.4? what do i use to open the file?

[aziarajohn]

I own the a ps2 so it should be legel to use the emulator and down load the games i already own.
what is the best emulator and what do i need and how to use it.
sorry I am new to this soo yeah.

plse any one,thnx