When many people think about billiards, they are really thinking about pool (also known as pool billiards or pocket billiards).
Specifically they think of one of the numerous variations of pool, such as eight-ball, nine-ball, straight pool, or one pocket, that are played on a 6-pocket table of 7-, 8-, or 9-foot length.
Certainly, in North America, one reason people commonly equate billiards with pool is because pool is the only game they’ve played. According to research done 10 years ago by the Billiards Congress of America, about 90% of billiards players in the US primarily play pool; the rest play snooker or carom billiards. But, another reason for the global association between billiards and pool is because of popular culture. Conduct any informal survey in which you ask people to name “billiards movies” and the most common responses are The Hustler (1961) and The Color of Money (1986).