Black does not play the move 1…d5 and seeks to contest the center by other means.Black places their own Queen’s Pawn in the center with 1…d5, equalizing control of the center.I’m going to break them down into two broad categories:
Many distinct opening systems can arise from the Queen’s Pawn Opening. Many opening systems under the umbrella of Queen’s Pawn Openings are defined more by their ideas than by specific move orders – though that’s not to say that sharp, precise variations don’t exist! This tends to afford each player a higher degree of flexibility than can be seen in a King’s Pawn opening.
In contrast with the King’s Pawn Opening, the Queen’s Pawn is already defended (by the queen) upon its arrival in the center of the board, so any threat to this pawn doesn’t necessarily have to be immediately addressed.