2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41585I briefly review the physical picture of the saturated gluons at small-x as a Colour Glass Condensate, and the effective theory which forms the basis of this picture.Talk given at 37th Rencontres de Moriond on QCD and Hadronic Interactions, Les Arcs, France, 16-23 Mar 2002High Energy Physics - Phenomenologytext