2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4341The last years have been an exciting period for the field of the Cosmic Microwave Background (CMB) research. With recent CMB balloon-borne and ground-based experiments we are entering a new era of 'precision' cosmology that enables us to use the CMB anisotropy measurements to constrain the cosmological parameters and test new theoretical scenarios.21 pages, 5 figures. Based on an invited review at the XIII Rencontres de Blois - Frontiers of the Universe, June 17-23,2001AstrophysicsHigh Energy Physics - Phenomenologytext