Domain Authority is a score, popularized by Moz on a 1 to 100 scale, that estimates a domain’s overall ranking strength. Similar metrics exist from other tools, such as Domain Rating from Ahrefs. They are built mostly from the size and quality of a site’s backlink profile.
What it is and is not
Domain Authority is a third-party prediction, not a metric Google uses. Google has repeatedly said it has no single “domain authority” score. The value of DA is comparative: it helps you gauge your site against competitors and track the trend of your link profile over time.
Treat it as a thermometer, not a target. Chasing the number itself, especially through low-quality links, produces no real ranking benefit and can cause harm.
How it is used in practice
- Competitive benchmarking. Comparing your score to rivals in the same niche.
- Link prospecting. Gauging the relative strength of sites you might earn links from.
- Trend monitoring. Watching whether your profile is strengthening as you earn quality links.
The shift toward entity trust
AI answer engines do not rely on a single authority score. They assess trust through a wider set of signals: consistent entity information, author credentials, independent corroboration across sources, and topical depth. A mid-authority site with strong author signals and clear expertise can out-cite a high-authority site that lacks them. Build real authority by earning relevant backlinks and demonstrable expertise, and the score follows.