2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/121040Young tableaux are classical combinatorial objects playing recurring and varied roles in representation theory, algebraic geometry and commutative algebra. This article is a short exposition on Young tableaux, written for the "WHAT IS...?" series of the Notices of the American Mathematical Society. It describes some of their properties and applications.A final copy-edited version is to appear in Notices. Amer. Math. SocCombinatoricstext