What is Poisoned Pawn Variation?

The Poisoned Pawn Variation is a specific sequence in chess openings where a pawn, which can be captured, is known as poisoned because the resulting position, although appearing beneficial for the capturing side, could lead to positional disadvantages or be outright losing due to a strong counter-attack from the opponent. This term is most commonly associated with the Sicilian Defense, particularly the Najdorf Variation.