2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/55840I review certain aspects of Hanany-Witten setups and other approaches used to embed (and solve) gauge theories in string theory. Applications covered include dualities in 4 and 3 dimensions, fixed points in 6 dimensions, phase transitions between different geometric backgrounds and dualities between branes and geometry.104 pages, LaTeX2e; based on PhD Thesis, Humboldt University, BerlinHigh Energy Physics - Theorytext