Why do modern golf balls have dimples?

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Tiger Woods follows through on his golf swing after teeing off, standing in tall grass with spectators watching in the background at St Andrews Golf Links. — golf American golfer Tiger Woods competing at the British Open (Open Championship) at St. Andrews, Fife, Scotland, 2005.

Modern golf balls feature dimples primarily to enhance their aerodynamic performance, specifically to achieve longer flight distances and greater control through backspin.1

While early golf balls were smooth, players discovered that damaged, nicked balls often traveled further than new ones. Manufacturers eventually replicated these imperfections intentionally. By creating a specific number, size, and arrangement of dimples—typically ranging from 324 to 492—engineers can manipulate the airflow around the ball during flight.1

These patterns help reduce drag and create lift, allowing the ball to stay in the air longer than a smooth sphere would under the same conditions. Today, designers use sophisticated geometric patterns, such as triangular or pentagonal groupings, to optimize these flight characteristics while ensuring the ball remains within the USGA standards for size, weight, and velocity.1