2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186849The B Factories have generated a large amount of new results on the tau lepton. The present status of some selected topics on tau physics is presented: charged-current universality tests, bounds on lepton-flavour violation, the determination of alpha_s from the inclusive tau hadronic width, and the measurement of |V_{us}| through the Cabibbo-suppressed decays of the tau lepton.Invited talk at the XXXI International Conference of Theoretical Physics, "Matter to the Deepest", Ustron, Poland, 5-11 September 2007High Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext