2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50595The low-energy effective action of supersymmetric D-brane systems consists of two terms, one of which is of the Born-Infeld type and one of which is of the Chern-Simons type. I briefly review the status of our understanding of these terms for both the Abelian and non-Abelian cases.10 pages; talk presented at Strings 2001High Energy Physics - Theorytext