2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43671In these lectures I present the key ideas driving the field of relativistic heavy-ion physics and develop some of the theoretical tools needed for the description and interpretation of heavy-ion collision experiments.74 pages, incl. 39 figures. Lecture Notes for lectures presented at the 2nd CERN - Latin-American School of High-Energy Physics, June 1-14, 2003, San Miguel Regla, Mexico. To appear as a CERN Yellow Report (N. Ellis, ed.). A shorter version of these Notes with the same title, summarizing lectures given a year earlier at the 2002 European School of High Energy Physics, appeared in CERN Yellow Report CERN-2004-001, pp.127-178 (see http://www.slac.stanford.edu/spires/find/hep/www?irn=5907233)High Energy Physics - Phenomenologytext