Wikidata – Free Open Knowledge Base

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Credibility Rating

3/5

Good(3)

Good quality. Reputable source with community review or editorial standards, but less rigorous than peer-reviewed venues.

Rating inherited from publication venue: Wikidata

Wikidata is a general-purpose structured knowledge base occasionally used in AI safety research for knowledge graph benchmarks, entity disambiguation, and as a reference ontology for evaluating language model factual accuracy.

Metadata

Importance: 35/100wiki pagedataset

Summary

Wikidata is a free, collaboratively edited knowledge base maintained by the Wikimedia Foundation, storing structured data for Wikipedia and other Wikimedia projects. It contains over 120 million data entities accessible to both humans and machines via open APIs and SPARQL queries. Its open, machine-readable format makes it a foundational resource for knowledge graphs, AI training data, and linked open data research.

Key Points

•Contains 120+ million structured data entities freely available under a CC0 public domain license
•Serves as the central structured data backend for Wikipedia, Wikivoyage, Wiktionary, and other Wikimedia projects
•Supports SPARQL query interface enabling complex, machine-readable knowledge graph queries
•Widely used as a training and evaluation dataset for AI/NLP systems and knowledge representation research
•Open contribution model allows individuals and organizations to donate and edit structured data

Cited by 1 page

Page	Type	Quality
AI Knowledge Monopoly	Risk	50.0

Cached Content Preview

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[Jump to content](https://www.wikidata.org/wiki/Wikidata:Main_Page#bodyContent)

From Wikidata

[![](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a3/Wikidata_nodes_in_white.svg/1920px-Wikidata_nodes_in_white.svg.png)](https://commons.wikimedia.org/wiki/File:Wikidata_nodes_in_white.svg)

**Welcome to Wikidata**

the [free](https://foundation.wikimedia.org/wiki/Terms_of_Use "wmf:Terms of Use") knowledge base with [120,848,825](https://www.wikidata.org/wiki/Special:Statistics "Special:Statistics") data [entities](https://www.wikidata.org/wiki/Special:MyLanguage/Wikidata:Glossary#Entity "Special:MyLanguage/Wikidata:Glossary") that [anyone can edit](https://www.wikidata.org/wiki/Special:MyLanguage/Wikidata:Contribute "Special:MyLanguage/Wikidata:Contribute").

[Introduction](https://www.wikidata.org/wiki/Special:MyLanguage/Wikidata:Introduction "Special:MyLanguage/Wikidata:Introduction") • [Project Chat](https://www.wikidata.org/wiki/Wikidata:Project_chat "Wikidata:Project chat") • [Community Portal](https://www.wikidata.org/wiki/Special:MyLanguage/Wikidata:Community_portal "Special:MyLanguage/Wikidata:Community portal") • [Help](https://www.wikidata.org/wiki/Special:MyLanguage/Help:Contents "Special:MyLanguage/Help:Contents")

**Want to help translate? [Translate the missing messages](https://www.wikidata.org/w/index.php?title=Special:Translate&group=agg-Main_Page&filter=%21translated&action=page).**

Welcome!

Wikidata is a free and open knowledge base that can be read and edited by both humans and machines.

Wikidata acts as central storage for the **structured data** of its Wikimedia sister projects including Wikipedia, Wikivoyage, Wiktionary, Wikisource, and others.

Wikidata also provides support to many other sites and services beyond just Wikimedia projects! The content of Wikidata is [available under a free license](https://creativecommons.org/publicdomain/zero/1.0/), [exported using standard formats](https://www.wikidata.org/wiki/Special:MyLanguage/Wikidata:Database_download "Special:MyLanguage/Wikidata:Database download"), and [can be interlinked to other open data sets](https://www.wikidata.org/wiki/Special:MyLanguage/Wikidata:Data_access "Special:MyLanguage/Wikidata:Data access") on the linked data web.

Get involved

_For a complete starters’ guide, visit the **[community portal](https://www.wikidata.org/wiki/Special:MyLanguage/Wikidata:Community_portal "Special:MyLanguage/Wikidata:Community portal").**_

_**Learn about Wikidata**_

- What is Wikidata? Read the **[Wikidata introduction](https://www.wikidata.org/wiki/Special:MyLanguage/Wikidata:Introduction "Special:MyLanguage/Wikidata:Introduction")**.
- Explore Wikidata by looking at a featured showcase item for author **[Douglas Adams (Q42)](https://www.wikidata.org/wiki/Q42 "Q42")**.
- Get started with Wikidata's **[SPARQL query service](https://www.wikidata.org/wiki/Special:MyLanguage/Wikidata:SPARQL_query_service/Wikidata_Query_Help "Special:MyLanguage/Wikidata:SPARQL quer

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Resource ID: 68df298e30be1cf5 | Stable ID: YTk4ODQ1Nj