piece of software (running on hardware) that hears HTTP requests and responds to them. Sometimes it simply delivers static documents, sometimes it's a WebApp
Sometimes an Application Server (like a Python Web Framework) will have its own built-in Web Server, other times it will run "behind" a separate server like Apache or LightTPD.
use Server Monitoring to make sure it's up
Log/Web Traffic analyzers
who uses what?
Standard library: Base Http Server, Simple Http Server, Cgi Http Server
httpy http://www.zetadev.com/software/httpy/ - competing with WSGI?
WSGI, Python Paste (these come with their own servers, in addition to having protocols to run behind Apache, etc.)
Security issues with Python Base Http Server, Simple Http Server, Cgi Http Server?