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# Wikidata
Wikidata is a large collaborative [Internet](internet.md) [project](project.md) (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 a large collaborative [Internet](internet.md) [project](project.md) (a sister project of [Wikipedia](wikipedia.md), hosted by Wikimedia Foundation) building a massively huge noncommercial [public domain](public_domain.md) [database](database.md) of [information](information.md) about everything in existence. 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 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.
It should be noted that Wikidata is incredibly useful but 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.
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. The database dump in [json](json.md), [COMPRESSED](compression.md) with gzip, takes gargantuous 130 GB.
The first items added to the database were the [Universe](universe.md), [Earth](earth.md), [life](life.md), [death](death.md), [human](people.md) etc. Some cool items include [nigger](nigger.md) (Q1455718), fart (Q5436447), [LMAO](lmao.md) (Q103319444), [Anarch](anarch.md) (Q114540914) and [this very wiki](lrs_wiki.md) (Q116266837). The structure of the database actually suggests that apart from the obvious usefulness of the data itself we may also toy around with this stuff in other [fun](fun.md) ways, for example we can use wikidata to give a hint of significance of any thing or concept -- given that two similar things predate wikidata itself, we may assume that the one with lower number is likely more significant for having been added earlier. For instance a [dog](dog.md)'s serial number is 144 and [cat](cat.md)'s is 146, so a dog would "win" this kind of internet battle by a tiny margin. Alternatively we can compare the size of the items' records to decide which one wins in significance. Here dog wins again with 200 kilobytes versus cat's 196 kilobytes.
## Database Structure