  The Color Glass Condensate formalism and its application to high energy heavy
ion collisions at RHIC are discussed. We argue that the RHIC data supports the
view that the Color Glass Condensate provides the initial conditions for
gold-gold collisions at RHIC while final state (Quark Gluon Plasma) effects are
responsible for the high $p_t$ suppression in mid rapidity. At forward
rapidities in deuteron-gold collisions, however, Color Glass Condensate is the
underlying physics of the observed suppression of the particle spectra and
their centrality dependence.
