I never knew there was a name for it, but I knew people used worms for composting. I was just reading up on vermicomposting because I didn't know what it was. One of the facts that I find interesting is that "a worm eats one half of their body weight in organic matter a day." I found this fact at:
Vermicomposting
I do make sure the worms stay in my garden box. I didn't realize how important they really are.