The Grünfeld Defense is a popular chess opening that arises after the moves 1.d4 Nf6 2.c4 g6 3.Nc3 d5. It is named after the Austrian chess player Siegbert Tarrasch and later popularized by Viktor Grünfeld. This defense allows Black to challenge White's center while developing pieces actively. In the Grünfeld Defense, Black aims to create counterplay against White's pawn structure. After the initial moves, White typically plays 4.cxd5, leading to dynamic positions where both sides have chances. The opening is known for its rich tactical and strategic complexity, appealing to players who enjoy active play.