A measure of a website's perceived expertise and comprehensiveness in a specific subject domain, used by both traditional search engines and AI systems to determine which sites to rank, cite, or recommend for domain-specific queries. Built through: publishing comprehensive, accurate content that covers all aspects of a specific topic domain (not just surface-level coverage); consistent content production in the domain over time; content depth (long-form, detailed articles) alongside content breadth (covering the full range of subtopics); internal linking that connects related content pieces and signals to search/AI systems that you cover the topic comprehensively. In affiliate marketing: a site with 100 detailed articles about affiliate marketing across all subtopics (publisher recruitment, commission structures, tracking technology, fraud prevention, GEO) has higher topical authority for affiliate marketing queries than a site with 10 general marketing articles that include some affiliate content. Topical authority benefits both traditional SEO rankings and GEO discoverability — it is the foundational signal that makes content the go-to source for a domain.
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