2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43043The idea of saturation of parton densities in small x physics is briefly introduced. Some aspects of saturation are described, mainly focusing on the status of our knowledge on the non-linear equations describing the high parton density regime. Implications of saturation ideas on the description of nuclear collisions at the Relativistic Heavy Ion Collider are discussed.8 pages in LaTeX using enclosed appolb.cls, 3 eps figures included using epsfig; minireview at the XXXIIIrd International Symposium on Multiparticle Dynamics (Kracow, Poland, September 5th-11th 2003)High Energy Physics - Phenomenologytext