Can someone explain what is a queen's gambit

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Pricessisthewinner

Can someone explain what is a queen's gambit

chessterd5

1.d4,d5 2.c4,... on move two black must decide whether to accept the gambit by taking the pawn on c4, declining the gambit by protecting his own pawn from capture, ignoring the capture to develop another peice, or attacking whites d pawn with Nc6.