2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/194953I review some basic facts about entropy bounds in general and about cosmological entropy bounds. Then I review the Causal Entropy Bound, the conditions for its validity and its application to the study of cosmological singularities. This article is based on joint work with Gabriele Veneziano and subsequent related research.50 pages, 4 figures, To appear in ``String theory and fundamental interactions" published in celebration of the 65 birthday of Gabriele VenezianoHigh Energy Physics - TheoryGeneral Relativity and Quantum Cosmologytext