A tennis court is a rectangular area where the game of tennis is played. It is typically 78 feet long and 36 feet wide for doubles matches, with a net dividing the court in the middle. The surface can be made of various materials, including grass, clay, or hard court, each affecting the speed and style of play. Courts are marked with lines that define the service boxes, baselines, and sidelines. Players serve the ball from behind the baseline and aim to hit it within the opponent's court boundaries. Proper maintenance of the court surface is essential for optimal play conditions.