I think the main purpose of Irish dance is for fun, enjoyment, and entertainment, but people do it for many reasons. It was created in Ireland as a way to celebrate and party, and was carried on to America and other countries. Now people compete in Irish dance competitions and go to dance classes - it's tons of fun. There is no real reason though, because you don't have a reason to dance, you just dance.
it was used for entertainment
A reel is a type of Irish dance and it is danced in soft-shoe. A treble reel is the hard-shoe version, with the same type of music.
Do you mean a reel?
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The sources of tap dancing include the Irish solo step dance, the English clog dance, and African dance movements.
i guess it would be called Irish step dancing
If what you are asking is What is the word for dance in Irish? It's damhsa [dhowsa] or rince [rink-ye].A dance as a function is damhsa, céilí [kaelee], or rince. For a short history on Irish dance see the link History of Irish Dance.The name for Irish dancing in Irish (Gaelic) is: rince Gaelach.
Jig or Irish step dance
Same reason any dance is - people enjoy it. Irish dance is a very beautiful dance.
I believe it is the Single Jig/Light Jig in Irish Dancing that was once a Irish Peasant Dance.
McConoghmy School of Irish Dance
a lively Irish dance with three letters is tap dance a jig?
they dance at feises
i call clumsy Irish dance something you need to work on
Irish Modern Dance Theatre was created in 1991.
When you do an Irish dance dahhh
River dance
it is a tap dance