Irish dance is a group of traditional dance forms originating in Ireland which can broadly be divided into social dance and performance dances. Irish social dances can be divided further into céilí and set dancing. Irish set dances are quadrilles, danced by 4 couples arranged in a square, while céilí dances are danced by varied formations (ceili) of couples of 2 to 16 people. In addition to their formation, there are significant stylistic differences between these two forms of social dance. Irish social dance is a living tradition, and variations in particular dances are found across the Irish dance community; in some places, dances are deliberately modified and new dances are choreographed.

Irish performance dancing is traditionally referred to as stepdance. Irish stepdance is notable for its rapid leg movements, body and arms being kept largely stationary. Most competitive stepdances are solo dances, though many stepdancers also perform and compete using céilí dances. The solo stepdance is generally characterized by a controlled but not rigid upper body, straight arms, and quick, precise movements of the feet. The solo dances can either be in "soft shoe" or hard shoe".

The dancing traditions of Ireland probably grew in close association with Irish traditional music. Originating in Pre-Christian Ireland, Irish dance was later influenced by dance forms from the Continent, especially the Quadrille. Travelling dancing masters taught all over Ireland, as late as the early 1900s.

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