What is EAT?
Expertise, Authoritativeness, and Trustworthiness, or E-A-T, is a guiding principle used by Google’s search quality raters to assess the efficacy and quality of search results. The Search Quality Rater Guidelines are used by quality raters, who are actual people, to assess how well Google’s search results satisfy users.

Rankings are not directly impacted by feedback from quality raters. But over time, it does assist Google in improving its algorithm. E-A-T, therefore, works hand in hand with SEO even if it isn’t a direct Google ranking criterion.