2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186688I discuss forms of high energy density matter in QCD. These include the Color Glass Condensate, the Glasma and the Quark Gluon Plasma. They all might be studied in ultra-relativistic heavy ion collisions, nd the Color Glass Condensate might also be probed in electron-hadron collisions. I present the properties of such matter and some aspects of what is known of their properties.Plenary talk presented at PASCOS 2007High Energy Physics - Phenomenologytext