A grass court is a type of tennis playing surface made from natural grass. It is known for its fast playing conditions, which can favor players with strong serve-and-volley skills. The most famous grass court tournament is Wimbledon, held annually in London, where players compete on this traditional surface. Grass courts require regular maintenance, including mowing and watering, to keep the grass healthy and playable. The surface can change throughout a match, becoming softer and slower as it is worn down by players' movements. This unique characteristic adds an element of unpredictability to the game.