2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49466This brief review of hard diffraction is focussed on the theory of the diffractive structure function F_2^D. Some aspects of diffractive vector meson production and of diffractive processes in hadron-hadron collisions are also discussed.4 pages LaTeX, talk at the Int. Europhysics Conference on High Energy Physics (EPS-HEP 99), Tampere, Finland, July 15-21, 1999High Energy Physics - Phenomenologytext