The Queen's Indian Defense is a chess opening that arises after the moves 1.d4 Nf6 2.c4 e6 3.Nf3 b6. It is a flexible and strategic choice for Black, allowing for a solid pawn structure while preparing to develop pieces harmoniously. The opening aims to control the center and create counterplay against White's position. In the Queen's Indian Defense, Black often fianchettoes the dark-squared bishop on b7, which exerts pressure on the center and the e4 square. This opening can lead to rich, complex positions, making it popular among players of all levels, including grandmasters.