2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/7309This contribution reviews the properties of nuclear activity in nearby galaxies, with emphasis on their implications for the demography of nuclear black holes and the nature of accretion flows in the regime of very low accretion rates.To appear in Multiwavelength AGN Surveys, ed. R. Maiolino and R. Mujica (Singapore: World Scientific), 2004. 10 pagesAstrophysicstext