2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/50717This is a brief review of vacuum string field theory, a new approach to open string field theory based on the stable vacuum of the tachyon. We discuss the sliver state explaining its role as a projector in the space of half-string functionals. We review the construction of D-brane solutions in vacuum string field theory, both in the algebraic approach and in the more general geometrical approach that emphasizes the role of boundary CFT. -- To appear in the Proceedings of Strings 2001, Mumbai, India.31 pages, 3 figures, LaTeX. Added references, a new subsection, and edited commentsHigh Energy Physics - Theorytext