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Core concept · Search
Definition
A relevance signal is any factor — including keyword usage, semantic context, entity associations, and structured data — that indicates to a search engine or AI system that content is pertinent to a given query. Relevance signals are evaluated alongside authority signals to determine retrieval priority.
Why It Matters for AI Search
Relevance signals work in combination with authority signals: high authority content that is not clearly relevant to a query may not be retrieved; highly relevant content from a low-authority source may be outcompeted. For brands, ensuring that key content pages send strong relevance signals for their target queries — through explicit entity references, clear topical focus, and appropriate structured data — is as important as building domain authority.
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