Well, Irish dance is called Irish dance, but is sometimes referred to as "Irish tap dancing" or "Irish step dancing. The correct name is Irish dance.
There are also different dances, such as:
And lots more. There are also traditional set dances, two, three, four, and even five hand dances.
There are various forms of dance - jigs, polkas, reels, 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