A fastball is the quickest pitch a baseball pitcher can throw, relying on pure speed rather than tricky movement. When a pitcher winds up and fires a fastball, the ball rockets toward home plate in an almost straight line, sometimes reaching speeds over 90 miles per hour in professional baseball.

The fastball is usually the first pitch young players learn because it's the most straightforward: grip the ball across the seams, throw hard, and aim for the strike zone. While other pitches like curveballs or sliders are designed to fool batters by curving or dipping unexpectedly, a fastball challenges them head-on. The batter sees it coming but has less than half a second to decide whether to swing.

Pitchers often use their fastball to establish control early in a game, showing batters they can throw strikes. A good fastball keeps batters honest and sets up other pitches. When announcers say a pitcher “has a good fastball,” they mean the pitch combines speed with accuracy.

Outside baseball, people sometimes use fastball to mean a direct, no-nonsense approach. If your teacher throws you a fastball question during class, they're asking something straightforward that requires a quick answer.