What is Queen Pawn Opening?

The Queen Pawn Opening is a term used in chess to describe the opening of a game where the player moves their Queen's Pawn two squares forward from its initial position, specifically to the d4 square. This opening move allows the player to control the center of the board and free the queen and bishop. Depending on the subsequent moves, it can lead to various specific opening systems such as the Queen's Gambit, the King's Indian Defense, or the Grünfeld Defense.