2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/98531The NA57 experiment has measured the production of strange and multi-strange hadrons in heavy-ion collisions at the CERN SPS. After briefly introducing the NA57 apparatus and analysis procedures, we present recent results on strangeness enhancement in Pb-Pb relative to p-Be collisions, on the study of the m_T distributions of strange particles, and on central-to-peripheral nuclear modification factors in Pb-Pb collisions at top SPS energy.8 pages, 5 figures, proceeding of plenary talk at Quark Matter 2005Nuclear Experimenttext