There are very very few Internet users who does not have any knowledge about Wikipedia or Wiki sites. These Wiki sites actually uses a different kind of platform, they are collectively known as Wiki software. Some are absolutely free of cost, while some costs whooping $ 100 / month.
Why a Business or Product website needs a separate Wiki ?
Goal of Wiki is to create a central site through which the most important product and project related information are available, which includes both internal documents such as documentation and protocols, as well as external sources such as business databases or online Reference. Furthermore, the contact addresses of employees, customers and partners can be maintained centrally. Finally, the internal portal on news about the company and its projects and products.
What are different Platforms used to construct these Wiki softwares ?
Can I install a Wiki on my server and run it publicly?
Definitely you can install and run a Wiki for your business website. Almost all Wiki softwares has a guideline, whether it is paid or Free; unlike other CMS or Forum softwares and the person who is the owner of the server have to maintain the spirit.
For most business website or corporates, a blog or a F.A.Q. page can provide the necessary information to the public, that is why Wiki is mostly used as an source for sharing the internal information and are not accessible publicly.
What is the difference between a Wiki and a Blog or Forum?
Wiki is designed for the advanced users, who will read the Wiki as well as add his / her own collected information, mostly interlink other Wiki pages.
Blogs or Forums are mostly commercial ventures now, where as Wiki is for free sharing of knowledge.
You can download Wikipedia English too. Do not forget to check the references for Wiki and the External Links for the Wiki softwares given at the bottom of the page.