While historically ballroom dance may refer to any form of formal social dancing as recreation, with the eminence of dancesport in modern times the term has become much narrower in scope, usually referring specifically to the International Standard and International Latin style dances (see dance groupings below). In the United States, two additional variations—"American Smooth" and "American Rhythm"—have also been popularized and are commonly recognized as styles of "ballroom dance".
The term "ballroom dancing" is derived from the word ball, which in turn originates from the Latin word ballare which means "to dance". In times past, ballroom dancing was "social dancing" for the privileged, leaving "folk dancing" for the lower classes. These boundaries have since become blurred, and it should be noted even in times long gone, many "ballroom" dances were really elevated folk dances.
In ballet, a pas de deux is a dance duet in which two dancers, typically a male and a female, perform ballet steps together. It usually has five parts, consisting of an entrée (introduction), an adagio, two variations (a solo for each dancer), and a coda (finale). The pas de deux is characteristic of classical ballet and can be found in many well-known ballets. It is often considered to be the bravura highlight of a ballet and is usually performed by a leading pair of principal dancers.