The National Basketball Association utilizes a game structure divided into four distinct periods. Each of these segments constitutes a quarter of the total regulation game time. This format contrasts with other basketball leagues and sports that might employ halves, periods, or other temporal divisions.
The four-quarter system allows for more frequent opportunities for strategic adjustments by coaches and provides television networks with more commercial breaks. Historically, this structure has been a defining characteristic of the professional game in North America, influencing the rhythm and pacing of contests. It allows for a perceived greater level of competition, maximizing excitement and opportunities for lead changes throughout the entirety of the scheduled game.