Exploration is basically a term used to describe any trip into a cave. For me, cave exploration is relaxing; an escape from my "other life" above ground. Some people like it because it is physically challanging while others get a thrill at seeing places that relativly few other people will ever see. Amber likes it "'cause it's awesome!"
There are a few important points to remember before you explore a cave:
Never go caving alone! Always have at least three other people with you.
Always tell someone where you are going and when you'll be back.
You could also try a wild tour at Wyandotte Cave. All three are good tours at a good price and will help you get started in caving. Marengo Cave also offers a wild tour, but I've never been on it.