2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/12239This article reviews the physics of advection-dominated accretion flows (ADAFs) and describes applications to several black hole X-ray binaries and galactic nuclei. The possibility of using ADAFs to explore the event horizons of black holes is highlighted.36 pages, incl. 17 Figures, uses cupconf.sty; to appear in "The Theory of Black Hole Accretion Discs", eds. M. A. Abramowicz, G. Bjornsson, and J. E. PringleAstrophysicsGeneral Relativity and Quantum Cosmologytext