Quick Answer: Pickleball is a racket sport in which two or four players use a smooth-faced paddle to hit a perforated, hollow plastic ball over a 34-inch-high net, until one side is unable to return the ball or commits a rule infraction. Pickleball is played indoors and outdoors. It was invented in 1965 as a children's backyard game in the United States, on Bainbridge Island in Washington State. In 2022, pickleball was named the official state sport of Washington. Aspects of the sport resemble tennis and table tennis played on a doubles badminton court, but pickleball has specific scoring rules, paddles, balls and court lines. On each side of the net is a 7-foot area known as the non-volley zone; a player standing there may not strike the ball before it has bounced. The hard plastic pickleball produces less bounce than a tennis ball. The limited bounce, non-volley zones, and underhand stroke, with which all serves must be made, give the game a dynamic pace.