imac g4

Hi, i have a imac g4 is their any decoders so i can play on them.

is see the dvd that i bought form a store but how do i play dvd's on

my imac g4 it is thier confusing but i can undstand the pc.

but the pc is the easy to play dvd you just stick it in and it play the dvd

but on this imac it show the dvd icon and how do i play the dvd