Set Dancing is a form of social dancing that has been done by people throughout Ireland for over a hundred years. It is not Irish Step Dancing, which is a performance and competition style of dancing.
In set dancing four couples stand in a square, like in square dancing, and perform a series of maneuvers to various Irish music types (reels, jigs, hornpipes, etc). The tempo and footwork are faster than similar dance forms, like square and contra dancing. Set dancing has become popular around the world and is enjoyed by people of all ages. You can see what it looks like at the following links:
Some find the dancing intimidating, but with enthusiasm and persistence you too can enjoy one of Ireland's popular traditions.