E-E-A-T
Experience, Expertise, Authoritativeness, and Trustworthiness — the four quality dimensions Google's raters use to evaluate content.
Definition
E-E-A-T stands for Experience, Expertise, Authoritativeness, and Trustworthiness. It is the framework described in Google's Search Quality Evaluator Guidelines (SQEG) — the document that human quality raters use to assess search result quality. Google added "Experience" (the first E) in December 2022, acknowledging that first-hand, lived experience (a product reviewer who actually used the product, a hiker who walked the trail) is a distinct quality signal from academic expertise.
Expertise refers to demonstrated knowledge in a subject area. Authoritativeness relates to the reputation of the author and website within their field — measured through mentions, citations, and backlinks from other authoritative sources. Trust is the overarching dimension; Google's guidelines state it is the most critical of the four, covering accuracy, transparency, and site security (HTTPS).
E-E-A-T is not a direct ranking factor in the same way that a meta tag is — there is no E-E-A-T score you can optimize. Rather, it is a set of quality dimensions that Google's machine learning systems attempt to model. Practical improvements include: publishing detailed author bios with credentials, citing sources, earning editorial backlinks, displaying trust signals (reviews, contact information, privacy policy), and creating content that demonstrates genuine real-world experience with the subject.