While Wikipedia is certainly the most prominent project of the Wikimedia Foundation, it is not the only one. Twelve different project websites are maintained currently, from Wikimedia Commons, the creative commons media library to Wikiquote, a quotation database and Wikisource, a collection of free and open texts. All of these projects are maintained independently from each other even though they are using the same framework.
Data changes up until now had to be handled independently as well. If the name of a city changed, or its population, all articles that referenced it had to be changed.
The introduction of Wikidata changes that. To explain it in simple terms: it is a data source that all Wikimedia projects - and third party projects as well - can make use of. Think of a variable that Wikipedia authors can add to articles that pulls the current information from Wikidata. Instead of having to edit the data in multiple articles, with the chance of missing some, it only needs to be edited on Wikidata so that the updated information are propagated automatically to all pages that use it as a source. This not only makes the editing more efficient - thanks to a single source that needs to be edited instead of multiple ones - but ensures that the data on Wikimedia properties is the same across all properties.
For a month, eleven Wikipedias (different language versions of Wikipedia) could make use of Wikidata in articles. The English Wikipedia was added to the group three days ago, and all other language versions of Wikipedia were added yesterday. What this means is that all Wikipedias can now make use of Wikidata as a source of data in articles that get published on the sites.
Wikidata is still a work in progress as the creators of the project mention in a blog post. Editors can use the new functionality in two ways. First by using a parser function, and second for things that are more complicated with the help of the LUA scripting language.
The data is licensed under the Creative Commons CC Zero license which indicates basically that the work is not copyrighted and available for the public domain.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.