Originally Posted by ulkoma
I googled it before asking, I need more clarification not just copy/paste
So go look it up....the answer provided and the Wikipedia article make it pretty clear as to what it does. Don't complain about what answers you get, especially given the attitude you've shown.
It sounds similar to processes that run on a mainframe-type environment. You certainly don't NEED it, in the strictest sense, but that would depend on your environment and goals.