The Najdorf Variation is a popular line in the Sicilian Defense, a chess opening that begins with the moves 1.e4 c5. Named after the Argentine chess player Miguel Najdorf, this variation is characterized by the move 5...a6, which allows Black to control the b5 square and prepare for further development. The Najdorf is known for its dynamic and complex positions, offering both sides chances for aggressive play. It has been employed by many top players, including Bobby Fischer and Garry Kasparov, making it a staple in competitive chess.