The term 'Pas de Deux' (Dance for Two) is a French phrase meaning 'step of two'. It is a type of dance in which two dancers perform a duet, usually with one lead and one follow. The Pas de Deux is often seen in classical ballet performances, and is considered to be one of the most technically demanding and beautiful pieces of choreography. It requires great skill and precision from both dancers, as they must move in perfect unison and harmony.