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Wikidata is a large collaborative project (a sister project of [Wikipedia](wikipedia.md), hosted by Wikimedia Foundation) for creating a huge noncommercial [public domain](public_domain.md) [database](database.md) containing information basically about everything. Well, not literally everything -- there are some rules about what can be included that are similar to those on [Wikipedia](wikipedia.md), e.g. notability (you can't add yourself unless you're notable enough, of course you can't add illegal data etc.). Wikidata records data in a form of so called [knowledge graph](knowledge_graph.md), i.e. it connects items and their properties with statements such as "Earth:location:inner Solar System", creating a mathematical structure called a [graph](graph.md). The whole database is available to anyone for any purpose without any conditions, under [CC0](cc0.md)!
Wikidata is wildly useful and greatly overlooked in the shadow of Wikipedia even though it offers a way to easily obtain large, absolutely [free](free_culture.md) and public domain data sets about anything. The database can be queried with specialized languages so one can e.g. get coordinates of all terrorist attacks that happened in certain time period, a list of famous male cats, visualize the tree of biological species, list Jews who run restaurants in Asia or any other crazy thing. Wikidata oftentimes contains extra information that's not present in the Wikipedia article about the item and that's not even quickly found by [googling](google.md), and the information is sometimes also backed by sources just like on Wikipedia, so it's nice to always check Wikidata when researching anything.
Wikidata is incredibly useful and a bit unfairly overlooked in the shadow of its giant sibling Wikipedia, even though it offers a way to easily obtain large, absolutely [free](free_culture.md) and public domain data sets about anything. The database can be queried with specialized languages so one can obtain let's say coordinates of all terrorist attacks that happened in certain time period, a list of famous male cats, visualize the tree of biological species, list Jews who run restaurants in Asia or any other crazy thing. Wikidata oftentimes contains extra information that's not present in the Wikipedia article about the item and that's not even quickly found by [googling](google.md), and the information is at times also backed by sources just like on Wikipedia, so it's nice to always check Wikidata when researching anything.
Wikidata was opened on 30 October 2012. The first data that were stored were links between different language versions of Wikipedia articles, later Wikipedia started to use Wikidata to store information to display in infoboxes in articles and so Wikidata grew and eventually became a database of its own. As of 2022 there is a little over 100 million items, over 1 billion statements and over 20000 active users.