What function do monks serve in society?

Question:

What function do monks serve in society?

They seem to keep to themselves and isolate themselves from society. If they don't integrate with society than do they serve a purpose? There have been some notable monks, Gregor Mendel for example, but he was famous for something other than what monks do. Can someone show me the light?

Best Answer - Chosen by Asker: It's related solely to their fashion sense.