A "bullseye" in the game of darts refers to the center of the dartboard, worth 50 points when hit. It is surrounded by the outer bull, which is worth 25 points. The bullseye is crucial for achieving a high score and is often targeted during games. Players aim for precision, as hitting the bullseye can contribute significantly to their overall score and strategy. Getting a bullseye consistently can showcase a player's skill and control over their throws.