Similar metrics include Ahrefs Domain Rating and Semrush Authority Score. Google does not use any of them, but they help compare websites with each other.
Read domain authority explained or check any domain with our Domain Authority Checker.
SEO glossary
Domain Authority
A third-party score that estimates how strong a website is in search, based mainly on its backlinks. The best-known version is Moz’s, on a scale of 1 to 100.