Can you take a break in the middle of college and pick it up again later?

If you take a leave of absence, do you still pay during your absence? - meaning, if you take a semester long break during the middle of your junior year, you end up paying tuition for nine semesters worth of schooling instead of eight by the time you graduate.

I’m also curious to learn a little more about financial aid. How is this affected by a leave of absence?