The Catalan Opening is a chess opening that begins with the moves 1.d4 Nf6 2.c4 e6 3.g3. It combines elements of both Queen's Pawn and King's Indian Defense openings, focusing on controlling the center while preparing to fianchetto the bishop on g2. This setup allows for a solid yet flexible position. Players who adopt the Catalan Opening aim for a strong pawn structure and long-term pressure on the center and the queenside. It is popular at all levels of play, including among top grandmasters, due to its strategic depth and potential for dynamic play.