TECHNICAL · SEO GLOSSARY
Entity Linking
The process of connecting mentions of named entities in web content to their canonical identifiers in public knowledge bases (Wikidata, DBpedia, Wikipedia) — making the entity association machine-readable for search engines and AI systems. Implemented in structured data via the sameAs property and in content via explicit links to Wikipedia or authoritative entity pages.
Definition
Entity linking is the NLP (natural language processing) and semantic SEO technique of connecting mentions of named entities in text to their unique, canonical identifiers in structured knowledge bases. Entity linking disambiguates ambiguous entity mentions (distinguishing "Apple" the company from "apple" the fruit), establishes the entity\'s identity within a knowledge graph, and creates explicit machine-readable connections between content and the broader semantic web of entity relationships. Entity linking methods: (1) **`sameAs` in JSON-LD**: the primary schema.org mechanism. Add `"sameAs": ["https://www.wikidata.org/wiki/Q312", "https://en.wikipedia.org/wiki/Apple_Inc."]` to an `Organization` schema block to link the organisation to its Wikidata and Wikipedia identities. Google uses `sameAs` to verify entity identity claims. (2) **Outbound links to authoritative entity pages**: linking from a page about an entity to that entity\'s Wikipedia page or Wikidata record provides a contextual entity link that NLP systems can process as an entity identifier. (3) **Automated entity recognition**: tools like WordLift use NLP to identify entity mentions in content and automatically add entity links (visible or invisible markup) to knowledge base identifiers. (4) **Structured data `@id`**: the `@id` property in JSON-LD provides a local entity identifier within the schema document, allowing multiple references to the same entity within a schema to be explicitly linked without duplicating the full entity description. The goal of entity linking in SEO is to help Google confidently identify which entity a page is about — reinforcing the entity-to-page association used in knowledge panel generation and entity-based ranking signals.
Why it matters for SEO
Google\'s Knowledge Graph powers knowledge panels, rich results, and AI Overviews — all of which depend on confident entity identification. A business website that never explicitly links to its Wikidata or Wikipedia entry (via `sameAs`) leaves the entity identification to inference, which is less reliable than explicit declaration. For branded searches, entity linking in schema is a direct lever for knowledge panel generation — and for AI search (ChatGPT, Perplexity, Claude), entity-linked content with verifiable knowledge base connections is more likely to be cited as authoritative than unlinked content.
How DeepSEOAnalysis checks this
DeepSEOAnalysis checks for `sameAs` in `Organization`, `Person`, and `LocalBusiness` JSON-LD — validating that the property is present and points to a valid URL (Wikipedia, Wikidata, authoritative social/official profiles). Missing `sameAs` in business or person schema is flagged as an entity linking gap. The audit does not validate the accuracy of the linked entity (whether the Wikidata QID actually matches the business) — that requires human verification.
Useful tools and resources
GLOSSARY
Related terms
technical
Semantic Entity
A distinct, identifiable real-world thing — person, place, organisation, concept, product — that search engines represent as a node in their knowledge graph and use as the basis for entity-based ranking signals, knowledge panel generation, and AI response synthesis. Google\'s Knowledge Graph contains hundreds of billions of entities with defined relationships between them.
Read definition →knowledge graph & entities
Knowledge Graph SEO
Strategies for influencing what information Google\'s Knowledge Graph displays about a brand, person, or organisation — including Knowledge Panel content, entity association with topics, and AI system citations.
Read definition →structured data
Structured Data
Machine-readable annotations added to HTML — usually JSON-LD — that explicitly describe what a page is about to search engines and AI systems.
Read definition →onpage
E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness)
Google\'s quality framework for evaluating content — especially important for YMYL (Your Money, Your Life) topics like health, finance, and legal.
Read definition →links
Topical Authority
A site\'s perceived depth of expertise in a subject area, built by covering a topic comprehensively rather than by accumulating generic backlinks.
Read definition →See how your site scores on Entity Linking.
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