In this talk I will show how the AdS/CFT correspondence has shed some
light into the novel physics of the strongly coupled quark-gluon
plasma formed in ultrarelativistic heavy ion collisions at RHIC and
LHC. I will discuss in detail how the AdS/CFT correspondence has been
used to understand the surprising fluid properties of the quark-gluon
plasma, which is thought to be the (hottest) most perfect fluid ever
created in the laboratory.