2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/63777This note is a survey of $J$-spaces.3 pages. This contribution is excerpted from a published article. Reprinted from Topology and its Applications, Volume 102, number 3, E. Michael, J-Spaces, pp.315--339General Topology54D20 (Primary) 54D30, 54D45, 54E45, 54F65 (Secondary)text