Can i ask a wee HDTV Question?

could someone explain to me the difference between HD and HD Ready.  and can i see things in HD with my PS3 if i get an HD Ready one.  is there anything else i would need to do in order to get HD picture quality?

Read this

"All of this really boils down to one key difference: does the set have a built in digital tuner or not? If it does, it's an HDTV; if it doesn't, it's HD Ready."

thanks.

oddly, i got an HDMI cable with my copy of oblivion.  have no idea why.  must have been some odd promotional thing