Slider

In baseball, a slider (also known as a yakker, a snapper, or a spinner) is a pitch that breaks laterally and down, with a speed between that of a curveball and that of 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.