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The Queen's Gambit is the chess opening that starts with the moves:[1]
1. d4 d5
2. c4
It is one of the oldest openings and is still commonly played today. It is traditionally described as a gambitbecause White appears to sacrifice the c-pawn; however, this could be considered a misnomer as Black cannot retain the pawn without incurring a disadvantage.[2][3]
Technically, any Black response other than 2...dxc4 (or another line with an early ...dxc4 that transposes into the QGA) is a Queen's Gambit Declined, but the Slav, Albin Countergambit, and Chigorin Defense are generally treated separately. There are so many QGD lines after 2...e6 that many of them are distinctive enough to warrant separate treatment. The Orthodox Defense and the Tarrasch Defenseare two important examples. (See Queen's Gambit Declined for more.)
After 1.d4 d5 2.c4:
2...e6 – Queen's Gambit Declinedor QGD (ECO D30–D69). This is the main line, with many variations.
2...dxc4 – Queen's Gambit Accepted or QGA (D20–D29). Less popular than the Queen's Gambit Declined, it nevertheless has a solid reputation.
Wikipedia is considered an excellent starting place for studying the opening
https://en.wikipedia.org/wiki/Queen%27s_Gambit
