What is Google's EAT score?

EAT stands for Expertise, Authority and Trust. It is part of Google’s ongoing attempts to stop people gaming the system, by forcing them to create useful quality content. Websites, companies, and content creators are all under the lens. The goal of EAT is to make web content better for human users.
Essentially, E-A-T determines a website’s value. Quality raters keep E-A-T in mind when judging how good a site or page provides what they need. They look to see if they’re getting a good online experience and if the content meets their standards. If the raters feel like a user would feel comfortable reading, sharing, and recommending the content, that earns the site a high level of E-A-T.