There are dozens of different wiki engines in use, both standalone and part of other software, such as bug tracking systems.
A wiki engine is a type of content management system, but it differs from most other such systems, including blog software, in that the content is created without any defined owner or leader, and wikis have little implicit structure, allowing structure to emerge according to the needs of the users."I've had nothing yet," Alice replied in an offended tone, "so I can't take more." "You mean you can't take less? "It's very easy to take more than nothing." Wikis can also make WYSIWYG editing available to users, usually by means of Java Script control that translates graphically entered formatting instructions into the corresponding HTML tags or wikitext.In those implementations, the markup of a newly edited, marked-up version of the page is generated and submitted to the server transparently, shielding the user from this technical detail.Generally, there is no review by a moderator or gatekeeper before modifications are accepted and thus lead to changes on the website.Many wikis are open to alteration by the general public without requiring registration of user accounts.Wikipedia is not a single wiki but rather a collection of hundreds of wikis, one for each language.