2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/198710I present an outline of chiral perturbation theory and discuss some recent developments in the field.10 pages (LaTex), 1 figure embedded with epsfig.sty. Uses espcrc2.sty. Invited talk given at the QCD Euroconference 99, Montpellier, 7-13th July, 1999. The present article contains additional references as compared to the version that will appear in the proceedingsHigh Energy Physics - Phenomenologytext