A man playing pool in Kenya. He is aiming at the red ball to try and "sink" it into a pocket.
A man playing billiards in Nigeria.
**Pool**, also known as **pocket billiards**, is the general term for a family of cue sports. These games are played on a pool table with six holes cut into them called pockets. One of the main goals of the game is to "sink" all the balls into the pockets. ("Sinking" the ball means that the ball rolls into a pocket.) There are many different types of pool, including eight-ball, nine-ball, and straight pool.

History
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Historic print depicting Michael Phelan's Billiard Saloon in New York City, January 1, 1859.
Outside the billiards industry, the various games played on these tables are very often called "pool". This is due to an association with the "poolrooms" where gamblers "pooled" together their money to bet on horse races. Because these places often provided billiard tables, the term "pool" became linked to billiards. Though the original "pool" games were played on pocketless carom billiards tables, the name stuck to pocket billiards as it gained in popularity. The traditional view of billiards as a refined and noble pastime did not blend well with the low-class connotations of gambling. Because of this, the billiards industry's attempts to distance itself from the term "pool" beginning in the late 19th century. They were largely unsuccessful.

There are hundreds of pool games. Some of the more well known include eight-ball, nine-ball, straight pool, and one-pocket. The game of snooker is played on a table with pockets but is considered separate from pool. It is governed internationally by the World Professional Billiards and Snooker Association (professional) and the International Billiards and Snooker Federation (amateur). There are also hybrid games combining traits of both pool and carom billiards, such as English billiards, American four-ball billiards, cowboy pool and bottle pool.

As a competitive sport, pool is governed internationally by the World Pool-Billiard Association (WPA), which has national affiliates such as the US Billiard Congress of America (BCA), and which represents pool in the World Confederation of Billiard Sports, which in turn represents all forms of cue sports in the International Olympic Committee.

Equipment
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Standard pool balls.
Pool uses different equipment from carom billiards. In addition pool tables having pockets, the balls for pool are generally smaller and range from 2.25 inches (57.15 mm) in diameter to 2.375 inches (60.33 mm) in diameter. By comparison, carom billiard balls are generally 2.375 inches (60.33 mm), or 61.5 millimetres (2.42 in). While UMB, the International Olympic Committee-recognized world carom billiards authority, permits balls as small as 61.0 millimetres (2.40 in), no major manufacturer produces such balls any longer. For that reason the normal standard is 61.5 millimetres (2.42 in). Modern pool tables range in size from 3.5 feet (1.07 m) by 7 feet (2.13 m), to 4.5 feet (1.37 m) by 9 feet (2.74 m). Modern cue sticks are generally 58.5 inches (148.6 cm) long for pool while cues prior to 1980 were designed for *straight pool* and had an average length of 57.5 inches (146.1 cm), while carom billiards cues are generally 56 inches (142.2 cm) long.