The shot clock is the 24-second timer that limits how long a team may hold the ball before attempting a shot that hits the rim.
The shot clock saved professional basketball. Before its adoption in 1954, teams that gained a lead could simply hold the ball, and games collapsed into stalls, most notoriously a 19 to 18 final in 1950. The Syracuse Nationals' owner pushed through the 24 second limit, a number derived from dividing the seconds in a game by the hundred or so shots the game's reformers wanted both teams to take.
The mechanics are simple and absolute. The attacking team has 24 seconds to attempt a shot that at least touches the rim; failure is a violation and the ball changes hands. In the modern rules an offensive rebound restarts the clock at 14 seconds rather than a full 24, a tweak designed to reward crashing the glass without restarting a whole possession.
Every era of offensive style is partly a shot clock story. The fast leagues of the 1960s, the deliberate half court teams of the 1990s, and the modern seven seconds or less offences all organized themselves against the same 24 second budget, and the clock ticking into single digits remains the sport's universal signal that a possession has gone wrong.
In use"Trapped in the corner, they let the shot clock run down and had to force a bad look."