2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/12966A large fraction of the AGNs detected by EGRET exhibit strong variability in many wavebands- from radio to the highest energy gamma-rays observed. The origin of the transient emission in blazars is presumably associated with relativistic jets. In this talk plausible variability mechanisms that may operate in blazars are discussed.4 pages. To Appear in the Proceedings of the Turku Workshope on "BL Lac Phenomenon"Astrophysicstext