Why do golf balls have dimples?
The Real Answer
Golf balls have dimples because the dimples change how air flows around the ball, reducing aerodynamic drag compared with a smooth ball. As the ball moves through the air, the dimples help the airflow stay attached to the surface longer, which makes the wake behind the ball smaller and reduces pressure drag.
That matters because a smooth golf ball would slow down much more quickly in flight. Dimples also interact with the ball’s spin, influencing lift and helping shape the trajectory of a shot. The exact size, depth, number, and pattern of dimples are part of the ball’s aerodynamic design.
More dimples do not automatically mean more distance, and deeper dimples are not automatically better. Their effect depends on the overall design of the ball and how the airflow behaves around it.
A golf ball is one of the few things we intentionally cover in hundreds of tiny dents and then get upset when it lands in one large dent. You spend four hours trying to keep it out of holes while aiming for a hole.
Why People Ask This
People ask because the dimples are such a distinctive feature that a smooth golf ball looks unfinished or fake. Since most balls are designed to be as smooth and round as possible, seeing a golf ball covered in small depressions makes it natural to wonder why deliberately making the surface uneven improves its flight.