Really it depends on what school and what dance your doing. It also depends on what level your in.
The dance steps are "owned" by the dance school that choreographs them. Because of this, you will most likely not be able to find any written out online unless you belong to a school of Irish dance.
The Jig was ment to be a light and lively dance The slip jig was a graceful, flowing dance performed only by girls The Reel is a bouncy dance
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
idudu dance steps idudu dance steps
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
Foreign dance steps
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