E-E-A-T is Google's shorthand for experience, expertise, authoritativeness and trustworthiness, the four qualities its human quality raters are told to look for when judging whether a page and the site behind it deserve to rank. It is a description of what Google wants to reward, not a score you can see or a tag you can add.
Trust is the one that counts most. A page can be expert and still fail if the site hides who wrote it, has no address, no reviews and no way to check the claims. For a law firm, a clinic or anyone handling money and health, Google holds the bar higher, because a wrong answer does real harm.
