  When probed at very high energies or small Bjorken x_bj, QCD degrees of
freedom manifest themselves as a medium of dense gluon matter called the Color
Glass Condensate. Its key property is the presence of a density induced
correlation length or inverse saturation scale R_s=1/Q_s. Energy dependence of
observables in this regime is calculable through evolution equations, the
JIMWLK equations, and characterized by scaling behavior in terms of Q_s. These
evolution equations share strong parallels with specific counterparts in jet
physics. Experimental relevance ranges from lepton proton and lepton nucleus
collisions to heavy ion collisions and cross correlates physics at virtually
all modern collider experiments.
