Entities and structured data
Wikidata
Wikidata is a free, collaborative, multilingual knowledge base that stores structured facts about people, places, organizations and ideas.
In plain words
Every thing in Wikidata is an item with its own ID: the letter Q and a number. The writer Douglas Adams, for example, is Q42.
Wikidata collects structured data to support Wikipedia, the other Wikimedia projects and anyone else who wants to use it.
Example
The JSON-LD below links a person to their Wikidata item. A machine reading it no longer has to guess which Douglas Adams the page is about.
{
"@context": "https://schema.org",
"@type": "Person",
"name": "Douglas Adams",
"sameAs": ["https://www.wikidata.org/wiki/Q42"]
}Why it matters for AI search
Names are often shared by several people or companies. A Wikidata ID points to exactly one.
Schema.org names a Wikidata entry as an example of a page you can put in sameAs to show an item’s identity without doubt.
What you can do
- Check whether your organization already has a Wikidata item.
- If it does, add its URL to the sameAs list in your Organization markup.
- Keep the facts on your own site consistent with it, starting with your official name.
Often confused with
- Wikipedia
- Wikipedia holds articles for people to read. Wikidata holds structured facts that machines and people can use.
- Knowledge Graph
- Google’s Knowledge Graph is Google’s own database. Wikidata is open to everyone.
Sources
Facts and sources last checked on 19 October 2026.
Related terms
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