What is a splitter pitch and how is it used in baseball?

A splitter pitch is a type of pitch in Baseball that is thrown with the same arm motion as a fastball, but has a downward movement similar to a forkball. It is used by pitchers to deceive batters and make the pitch appear as a fastball before dropping sharply as it reaches the plate. This can cause batters to swing and miss or make weak contact with the ball.