A knuckleball is a type of pitch in baseball that is thrown with minimal spin, causing it to flutter erratically on its way to the batter. It is one of the most difficult pitches to hit, as it is hard to predict where the ball will end up.
Knuckleballs are thrown with a loose grip, and the pitcher does not impart any spin on the ball. This causes the ball to wobble as it travels through the air, making it difficult for the batter to track. Knuckleballs are typically thrown at a slower speed than other pitches, which also contributes to their unpredictability.