2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/10948We present a broad review on black holes. We analyse some of the fundamental concepts in black hole theory, the observational and theoretical status of stellar and galactic black holes, and their appearance as quantum objects.review paper, 18 pages, Latex. Based on the seminar presented in the XXIth Brazilian Astronomical Society Meeting (1995), which has appeared on the corresponding Proceedings, edited by F. Jablonski, F. Elizalde, L. Sodre' Jr., V. Jatenco-Pereira, IAG-USP, 1996AstrophysicsGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext