The Gambit Declined is a chess opening that arises after the moves 1.e4 e5 2.Nf3 Nc6 3.Bc4. In this position, if Black chooses not to accept the Evans Gambit by playing 3...Bc5, it leads to a variety of solid responses. This opening allows Black to maintain a strong pawn structure and develop pieces harmoniously. Players often choose the Gambit Declined to avoid the complexities of gambit play, focusing instead on solid development and control of the center. It can lead to rich middlegame positions where both sides have chances for strategic play, making it a popular choice among players of all levels.