What is Domain authority?

Domain authority was invented by an SEO software company, not by Google. It looks at a site's backlinks and other signals, then produces a score from 1 to 100. Similar scores exist under other names from other tools.

It is useful for rough comparisons. If a competitor scores far above you, outranking them on competitive terms will take time. It also helps you judge whether a site linking to you carries weight.

Do not chase the score itself. It moves slowly and indirectly. Publish content worth linking to and the score follows.