2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16349This paper is an introduction to some of the main present issues in the theory of structural glasses. After recalling a few experimental facts, it gives a short account of the analogy between fragile glasses and the mean field discontinuous spin glasses. The many valley picture is presented, and a brief account of recent attempts to obtain quantitative results from first principle computations is summarised.15 pages, 7 figures, prepared for the Proceedings of the 2000 Aspen workshop "50 years of Condensed Matter Physics"Statistical MechanicsDisordered Systems and Neural NetworksMaterials Sciencetext