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A wiki (IPA: [ˈwɪ.kiː] <WICK-ee> or [ˈwiː.kiː] <WEE-kee>) is a type of Web site that allows the visitors themselves to easily add, remove, and otherwise edit and change some available content, sometimes without the need for registration. This ease of interaction and operation makes a wiki an effective tool for collaborative authoring. The term wiki also can refer to the collaborative software itself (wiki engine) that facilitates the operation of such a Web site, or to certain specific wiki sites, including the computer science site (the original wiki) WikiWikiWeb and on-line encyclopedias such as Wikipedia.
The first such software to be called a wiki, WikiWikiWeb, was named by Ward Cunningham. Cunningham remembered a Honolulu International Airport counter employee telling him to take the so-called "Wiki Wiki" Chance RT-52 shuttle bus line that runs between the airport's terminals. According to Cunningham, "I chose wiki-wiki as an alliterative substitute for 'quick' and thereby avoided naming this stuff quick-web." "Wiki Wiki" is a reduplication of "wiki", a Hawaiian-language word for fast. The word wiki is a shorter form of wiki wiki (weekie, weekie). The word is sometimes interpreted as the backronym for "what I know is", which describes the knowledge contribution, storage, and exchange function.
According to Cunningham, the idea of 'wiki' can be traced back to a HyperCard stack he wrote in the late 1980s. In the late 1990s, wikis were increasingly recognized as a promising way to develop private and public knowledge bases, and this potential inspired the founders of the Nupedia encyclopedia project, which later became Wikipedia. In the early 2000s, wikis were increasingly adopted in the enterprise as collaborative software. Common uses included project communication, intranets, and documentation, initially for technical users. In December 2002, Socialtext launched the first commercial open-source wiki solution. Open-source wiki software was widely available, downloaded, and installed throughout these years. Today some companies use wikis as their only collaborative software and as a replacement for static intranets. There may be greater use of wikis behind firewalls than on the public Internet.
A wiki enables documents to be written very collaboratively in a simple markup language using a web browser. A single page in a wiki is referred to as a "wiki page", while the entire body of pages, which are usually highly interconnected via hyperlinks, is "the wiki"; in effect, a wiki is actually a very simple, easy-to-use user-maintained database for searching or even creating information.
A defining characteristic of wiki technology is the ease with which pages can be created and updated. Generally, there is no review before modifications are accepted. Most wikis are open to the general public without the need to register any user account. Sometimes session log-in is requested to acquire a "wiki-signature" cookie for autosigning edits. Many edits, however, can be made in real-time, and appear almost instantaneously online. This can lead to abuse of the system. Private wiki servers require user authentication to edit, sometimes even to read pages.
Pages and editing
The source format, sometimes known as "wikitext'", is augmented with a simplified markup language to indicate various structural and visual conventions. An often used example of one such convention is to start a line of text with an asterisk ("*") in order to mark it as an item in a bulleted list. Style and syntax can vary a great deal among implementations, some of which also allow HTML tags.
The reasoning behind this design is that HTML, with its many cryptic tags, is not especially human-readable. Making typical HTML source visible makes the actual text content very hard to read and edit for most users. It is therefore better to promote plain-text editing with a few simple conventions for structure and style.
(Quotation above from Foundation by Isaac Asimov)
Although for years the de facto standard was the syntax of the original WikiWikiWeb, currently the formatting instructions vary depending on the wiki engine. Simple wikis allow only basic text formatting, whereas more complex ones have support for tables, images, formulas, or even interactive elements such as polls and games. At present there is no standard for wiki markup.
Linking and creating pages
Wikis are a hypertext medium, with non-linear navigational structures. Each page typically contains a large number of links to other pages. Hierarchical navigation pages often exist in larger wikis, often a consequence of the original page creation process, but they do not have to be used. Links are created using a specific syntax, the so-called "link pattern".
Originally, most wikis used CamelCase when naming program identifiers, produced by capitalizing words in a phrase and removing the spaces between them (the word "CamelCase" is itself an example). While CamelCase makes linking very easy, it also leads to links which are written in a form that deviates from the standard spelling. CamelCase-based wikis are instantly recognizable because they have many links with names such as "TableOfContents" and "BeginnerQuestions". Note that it is possible for a wiki to render the visible anchor for such links "pretty" by reinserting spaces, and possibly also reverting to lower case. However, this reprocessing of the link to improve the readability of the anchor is limited by the loss of capitalization information caused by CamelCase reversal. For example, "RichardWagner" should be rendered as "Richard Wagner", whereas "PopularMusic" should be rendered as "popular music". There is no easy way to determine which capital letters should remain capitalized. As a result, many wikis now have "free linking" using brackets, and some disable CamelCase by default.
Most wikis offer at least a title search, and sometimes a full-text search. The scalability of the search depends on whether the wiki engine uses a database; indexed database access is necessary for high speed searches on large wikis.
Server-side versus client-side wiki
By far, the most common wiki systems are server-side. In essence, the edit, display and control functions are provided on the server through the wikiengine that renders the content into an HTML-based page for display in a web browser.
A client-side wiki system requires only that the server "serve" wiki files in much the same way that a web server allows HTML files to be retrieved using HTTP. In this type of wiki system, all the execution required to convert the underlying wiki text into an onscreen formatted display page resides in the client browser. Likewise, the editing tools and functionality reside in the browser.
The client-side wiki system parallels HTML in that the page becomes a rendering instruction for the browser to interpret. Client-side wiki systems may be little more than a code plugin to a more traditional web browser.
Web-based versus peer-to-peer
Most wikis are based on a web server. The server can be open to everybody on the Internet, or part of a private LAN, with limited access. There is also a version of wiki that can be shared between peers, with no need for a web server. Such Peer-to-peer wiki system is integrated with a P2P version-control system that takes care of versioning and distribution of pages.
Wikis are generally designed with the philosophy of making it easy to correct mistakes, rather than making it difficult to make them. Thus while wikis are very open, they provide a means to verify the validity of recent additions to the body of pages. The most prominent, on almost every wiki, is the "Recent Changes" page—a specific list numbering recent edits, or a list of all the edits made within a given timeframe. Some wikis can filter the list to remove minor edits and edits made by automatic importing scripts ("bots").
From the change log, other functions are accessible in most wikis: the Revision History showing previous page versions; and the diff feature, highlighting the changes between two revisions. Using the Revision History, an editor can view and restore a previous version of the article. The diff feature can be used to decide whether or not this is necessary. A regular wiki user can view the diff of an edit listed on the "Recent Changes" page and, if it is an unacceptable edit, consult the history, restoring a previous revision; this process is more or less streamlined, depending on the wiki software used.
In case unacceptable edits are missed on the "Recent Changes" page, some wiki engines provide additional content control. It can be monitored to ensure that a page, or a set of pages, keeps its quality. A person willing to maintain pages will be warned of modifications to the pages, allowing him or her to verify the validity of new editions quickly.
The open philosophy of most wikis—of allowing anyone to edit content—does not ensure that editors are well intentioned. The approach of making damage easy to undo rather than attempting to prevent damage has been characterized as soft security. Many editors of wiki sites tend to have good intentions, although on larger wiki sites, vandalism can go unnoticed for a period of time. Another bothersome feature in wikis is trolling.
Many wiki communities are private, particularly within enterprises as collaborative software. They are often used as internal documentation for in-house systems and applications. The democratic, all-encompassing nature of Wikipedia is a significant factor in its growth, while many other wikis are highly specialized.
There also exist WikiNodes which are pages on wikis that describe related wikis. They are usually organized as neighbors and delegates. A neighbor wiki is simply a wiki that may discuss similar content or may otherwise be of interest. A delegate wiki is a wiki that agrees to have certain content delegated to that wiki.
One way of finding a wiki on a specific subject is to follow the wiki-node network from wiki to wiki; another is to take a Wiki "bus tour," for example: Wikipedia's Tour Bus Stop. Domain names containing "wiki" are growing in popularity to support specific niches.
For those interested in creating their own wiki, there are many publicly available "wiki farms", some of which can also make private, password-protected wikis. PeanutButterWiki, BrainKeeper, Socialtext, Wetpaint, and Wikia are popular examples of such services. For more info, see List of wiki farms.
Some wikis have been created without much user input. For example, Richdex the Open Free Online Directory is the world's largest wiki by total number of articles, however most articles appear to be computer generated hyperlinks that consist mainly of Google Ad-Sense advertisements. The English-language Wikipedia is the second-largest, but is by far the largest wiki created by individual users. The other Wikipedias fill many of the remaining upper slots. Other large wikis include the WikiWikiWeb, Memory Alpha, Wikitravel, World66 and Susning.nu, a Swedish-language knowledge base. The largest wikis are listed and updated on Mediawiki. Many public wikis are listed at WikiIndex which is a wiki of wikis.
Wikis and content management systems
Wikis have shared, and encouraged, several features with generalized content management systems (CMS) which are used by enterprises and communities-of-practice. Those looking to compare a CMS with an enterprise wiki should consider these basic features:
- The name of an article is embedded in the hyperlink.
- Articles can be created or edited at anytime by anyone (with certain limitations for protected articles).
- Articles are editable through the web browser.
- Each article provides one-click access to the history/versioning page, which also supports version differencing ("diff") and retrieving prior versions.
- Each article provides one-click access to a discussion page particular to that article.
- The most recent additions/modifications of articles can be monitored actively or passively.
None of these are particular to a wiki, and some have developed independently. Still the concept of a wiki unequivocally refers to this core set of features. Taken together, they fit the generative nature of the Internet (as scholar Jonathan Zittrain has labeled it), in encouraging each user to help build it. It is yet to be studied whether an enterprise wiki encourages more usage, or leads to more knowledgeable community members, than other content management systems.
Dictionary definitions from Wiktionary
Textbooks from Wikibooks
Quotations from Wikiquote
Source texts from Wikisource
Images and media from Commons
News stories from Wikinews
Learning resources from Wikiversity
- Comparison of wiki farms
- Comparison of wiki software
- List of wikis
- List of wiki software
- Massively distributed collaboration
- Wiki farm
- Wiki help
- Semantic wiki
- Social software
- Content management
- Content management system
- ^ according to Don Perrin
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- New Media: Who are the real winners now we've all gone Wiki-crazy?
- Father of Wiki Speaks Out on Community and Collaborative Development, eWeek, March 20 
- Wikis at HowStuffWorks.
- "Information Wants to be Liquid" — Wired magazine article
- Wiki Engines
- What's a Wiki?
- Wiki Science
- How to start a wiki (on Wikibooks) — help write the book on starting a wiki
- WikiWikiWeb (the first wiki)
- Science in the Web Age: Joint Efforts on wikis and the scientific community, from Nature magazine
- www.wikimatrix.org: A side-by-side comparison of many different wiki installations.
- New Media: Who are the real winners now we've all gone Wiki-Loopy? (subscription required to read beyond intro)
- Operation of a Large Scale, General Purpose Wiki Website Book abstract
- A online wiki for tutorials.
- Html => Wiki convertor
Categories: Articles with unsourced statements | Articles to be merged since October 2006 | Groupware | Internet terminology | Wiki | Hawaiian words | Types of communities