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Knuckleballs are a type of pitch in baseball that is characterized by its lack of spin, causing the ball to move unpredictably and erratically as it approaches the batter. This pitch is thrown with the knuckles or fingertips, rather than the usual grip on the seams of the ball, resulting in a slower speed and a fluttering trajectory. Knuckleballs are known for being difficult to hit and control, making them a unique and challenging pitch for both pitchers and batters.