2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52510This lecture reviews the black hole information paradox and briefly appraises some proposed resolutions in view of developments in string theory. It goes on to give an elementary introduction to the holographic principle.19 pages, 7 figures, invited lecture at the Gunnar Nordstrom Symposium on Theoretical Physics, Helsinki, August 27-30, 2003High Energy Physics - Theorytext