Where Did The Term “Domain Authority" Even Come From?

If you've spent any time reading about SEO, you've almost certainly come across the term Domain Authority, or DA. It gets thrown around a lot, in sales pitches, in link-building offers, in casual comparisons between websites. But, surprisingly few explanations actually cover what it means, where it comes from, and what it's genuinely useful for.

What Does Domain Authority Mean?

Domain Authority is a score, from 1 to 100, that predicts how likely a website is to rank in search engine results. The higher the number, the stronger a site's overall “authority” is considered to be, relative to the rest of the web. In simple terms: a website with a DA of 60 is generally expected to have an easier time ranking than a website with a DA of 15, all else being equal.

It's important to understand what Domain Authority is measuring. It isn't a score for how good your website looks, how well-written your content is, or how much traffic you get. It's specifically a reflection of your backlink profile, the number and quality of other websites linking back to yours.

Domain Authority was developed by Moz, an SEO software and analytics company, as a way to give website owners and marketers a single, easy-to-understand number for comparing the relative strength of different domains. It isn't a Google metric, and Google has confirmed it plays no role in determining actual search rankings. It's a third-party estimate, built by Moz, using Moz's own data.

That distinction really matters. Because DA is proprietary to Moz, other SEO tools have built their own, similarly-styled scores, Ahrefs, for example, uses “Domain Rating” (DR). Both aim to measure a similar concept, but they're calculated differently and pull from different link databases, so a site's DA and DR scores are rarely identical.

How Is Domain Authority Measured?

Moz calculates Domain Authority using a machine-learning model that looks at dozens of factors related to a website's link profile, then compares that data against millions of other domains to produce a single, comparative score. The scale runs from 1 to 100, and it's logarithmic rather than linear, meaning it gets progressively harder to gain each additional point as you move up the scale.

What Domain Authority Takes Into Account

The number of unique domains linking to your site (referring domains), rather than the total number of individual links.

• The authority of those linking domains. a link from a well-established, trusted site counts for more than several links from low-quality ones.

The overall size and quality of your site's link profile compared to the rest of the web.

Signals associated with spam or manipulative link-building practices, which can negatively impact your score.

Is a High Domain Authority Score Good?

• Generally, yes. a higher DA suggests a stronger, more established backlink profile, which tends to correlate with better ranking potential. But it's worth treating DA as a directional indicator rather than a badge of honour. A high score doesn't guarantee rankings, and a low score doesn't rule them out, particularly for less competitive search terms. It's most useful as a way of comparing your own site's progress over time, or getting a rough sense of how tough a market is before targeting it.

What's the Difference Between Domain Authority and Page Authority?

Domain Authority scores an entire website. Page Authority, another Moz metric, scores an individual page within that site. It's possible for a website with a modest overall DA to have one specific page with a much higher Page Authority, usually because that particular page has attracted a disproportionate number of quality backlinks of its own.

How Often Does Domain Authority Update?

Moz recalculates Domain Authority roughly once a month, as it recrawls the web and updates its link index. Because DA is a comparative score, measuring your site against everyone else's, not against a fixed standard, your number can move even if you haven't built a single new link. If competing domains across the web gain authority faster than yours, your relative score can drop; if they lose ground, yours can rise, all without any action on your part.

Common Misconceptions About Domain Authority

Because DA gets used so loosely in marketing and sales conversations, a few myths have stuck around it. It's worth clearing these up directly:

“A higher DA guarantees higher rankings.” Sorry to be the bearers of bad news, it doesn't. DA correlates loosely with ranking potential, but plenty of lower-DA sites outrank higher-DA competitors for specific search terms, particularly when their content is more relevant or better matched to search intent.

“DA is a Google metric.” It isn't. Google has been explicit that it does not use Domain Authority, or any similar third-party score, anywhere in its ranking systems.

“You can buy Domain Authority directly.” You can't buy the score itself, only the backlinks that might, over time, influence it. Be wary of anyone selling a guaranteed DA increase; it's usually a sign of low-quality, potentially harmful link-building tactics.

“A DA of 100 is the goal.” In practice, only a small number of globally dominant websites, think Google, Facebook, or Wikipedia, sit anywhere near the top of the scale. For most businesses, steady upward movement matters far more than the number itself.

Domain Authority In A Nutshell

Domain Authority is a third-party score, built by Moz, that estimates how strong a website's backlink profile is on a 1-to-100 scale. Google has no involvement in it and doesn't use it to decide rankings, but it's still a genuinely useful way to track how your site's authority stacks up against the rest of the web, and whether your link-building is actually paying off over time.