2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/13229I review why we expect the CMB anisotropy to be polarized, what we can learn from studying polarization and the level of the experimental challenge it presents. A discussion of current and future polarization sensitive experiments will focus on the expected sensitivity of PLANCK.To appear in the Proceedings of the MPA/ESO Conference "Evolution of large-scale structure", Garching, August 1998Astrophysicstext