Direct Answer
An author bio is a short biographical summary attached to every article on a website, with the author's name, photo, role, expertise, and a link to a full author page. Yes, every service-business article needs one — it is the strongest E-E-A-T signal Google and AI Overviews use to evaluate content authority.
Voice answer (≤30 words)
“An author bio is a short biography attached to every article. Yes — it is the strongest E-E-A-T signal Google uses for content authority.”
Add Person schema linking the author byline to the author's full page. Both Google and AI Overviews recognize this entity link.
Bios should mention specific credentials, years of experience, or named work — vague bios add little authority.