Pickleball is a racket or paddle sport in which two players (singles) or four players (doubles) use a smooth-faced paddle to hit a perforated, hollow plastic ball over a 34-inch-high (0.86 m) net until one side is unable to return the ball or commits a rule infraction. Pickleball is played indoors and outdoors. Aspects of the sport resemble tennis and table tennis, but pickleball has specific rules, paddles and court dimensions. The court is 44 feet (13.4m) long and 20 feet (6.1m) wide, and the paddle is larger than the one used in table tennis. The hard plastic ball used in pickleball produces less bounce than tennis balls. On each side of the net is a 7-foot area (2.1 m) known as the non-volley zone (or the kitchen); a player standing there may not strike the ball until it has bounced. The rules specify side out scoring, where only the server side can score a point. The limited bounce, non-volley zones, and underhanded stroke, with which all serves are made.