AI & GEO
Expertise (E-E-A-T)
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What is Expertise (E-E-A-T)?
Expertise, as a component of E-E-A-T, refers to the depth of knowledge and skill demonstrated by the content creator on the subject they are writing about. Google's Quality Raters assess whether the main content of a page was created by someone with sufficient subject-matter knowledge to be genuinely useful and accurate.
Demonstrating expertise involves signals such as detailed author bios with verifiable credentials, accurate and well-sourced information, appropriate use of technical terminology, and a consistent track record of publishing quality content in a specific domain. For professional topics like medicine or law, formal credentials matter more; for lifestyle or hobbyist topics, demonstrated passion and practical experience can suffice.
Why it matters for SEO
Google's systems aim to reward genuine subject-matter knowledge, a goal reinforced by core updates and the helpful content system (which Google folded into its core ranking systems in March 2024). Demonstrating expertise through author credentials, accurate content and authoritative sourcing helps pages compete on competitive, high-stakes queries.
Example
A page about adjusting insulin doses is reviewed by a named endocrinologist, with her credentials and the review date shown under the headline. A page about keeping a sourdough starter alive needs no formal qualification: a baker who shows years of results, explains why starters fail and answers readers' questions demonstrates the everyday expertise that topic calls for.
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