Question!!! Is there any program that read powerpoint presentations on a mac?

I dont have Windows and i need to open up power point presentations to get the notes from class because i missed a couple of days of class and normally im in school all the time
so is there something in the internet that can read powerpoint presentations???
can you guys/gals show me a site or anything i would ask a friend to print them out for me ... but i dont waste their ink cartridges
thanks in advance!!!