2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50851Born-Infeld theory is the non-linear generalization of Maxwell electrodynamics. It naturally arises as the low-energy effective action of open strings, and it is also part of the world-volume effective action of D-branes. The N=1 and N=2 supersymmetric generalizations of the Born-Infeld action are closely related to partial spontaneous breaking of rigid extended supersymmetry. We review some remarkable features of the Born-Infeld action and outline its supersymmetric generalizations in four dimensions. The non-abelian N=1 supersymmetric extension of the Born-Infeld theory and its N=1 supergravitational avatars are given in superspace.12 pages, LaTeX; invited talk at the 7th international Wigner Symposium in College Park, Maryland, USAHigh Energy Physics - Theorytext