2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3262We briefly review our current understanding for the formation, acceleration and collimation of winds to jets associated with compact astrophysical objects such as AGN and microQuasars.32 pages, 8 figures, to be published in Springer Verlag Lecture Notes in Physics "Relativistic Flows in Astrophysics" Georganopoulos et al. (Eds.), Mykonos conference, October 2000Astrophysicstext