Snooker ( /ˈsnʊkər/ or /ˈsnuːkər/) is a cue sport that is played on a large green baize-covered table with pockets in each of the four corners and in the middle of each of the long side cushions. A regular (full-size) table is 12 × 6 ft (3.7 × 1.8 m). It is played using a cue and snooker balls: one white cue ball, 15 red balls worth one point each, and six balls of different colours: yellow (2 points), green (3), brown (4), blue (5), pink (6) and black (7). A player (or team) wins a frame (individual game) of snooker by scoring more points than the opponent(s), using the cue ball to pot the red and coloured balls. A player wins a match when a certain number of frames have been won.
Snooker, generally regarded as having been invented in India by British Army officers, is popular in many of the English-speaking and Commonwealth countries, with top professional players attaining multi-million pound career earnings from the game. The sport is particularly and increasingly popular in China.

Source: Snooker on Wikipedia