why the multiple web servers?

I'm trying to understand how the multiple web servers interact w/one another in a rails deployment. If I've got thin or mongrel or what have you serving my app, what's apache doing for me? What can I read to clear this up for me?

Thanks!

-Roy

I'm trying to understand how the multiple web servers interact w/one another in a rails deployment. If I've got thin or mongrel or what have you serving my app, what's apache doing for me? What can I read to clear this up for me?

Ah--okay then. Thanks!