"A Wiki engine is a type of collaborative software that runs a
wiki system. This facilitates web pages being created and edited
using a web browser. This type of software is usually implemented
as an application server that runs on one or more web servers.
"Wikis try to make it as simple as possible to write and share
useful content, using intuitive page naming and text formatting
conventions. Wikis are usually (but not always) wide open and
assume a cooperating community. However, with spam bots prevalent,
most wiki engines have lots of anti-spam measures such as page
permissions, Access Control Lists, host blocking, blacklists, and
CAPTCHAs in place."