In baseball, a slider (also known as a yakker or a snapper) is a pitch that breaks (changes course sharply) laterally and down, with a speed between that of a curveball and a fastball.The break on the pitch is shorter than that of a curveball. The release technique of a slider is between a curveball and a fastball. The slider is similar to the cutter, a pitch which is thrown as a fastball, but differs in the sense that a slider tends to be more of a breaking ball.