Domain Authority is one of the most misunderstood numbers in the industry, and most of the confusion comes from a single fact that is rarely stated clearly enough.

Google does not use Domain Authority

Domain Authority is a metric invented and calculated by Moz, a software company. Ahrefs has an equivalent called Domain Rating, Semrush has Authority Score, Majestic has Trust Flow. They are all third-party estimates produced by private companies from their own link crawls.

None of them is a Google metric. Google does not publish a site-level authority score, does not use Moz's number, and has said repeatedly that it has no single site-wide authority figure of this kind. Whatever Google does internally, it is not the number on your Moz dashboard.

This matters because of how people behave when they forget it. They set a DA target, buy links from sites above that threshold, and treat the number as a goal in itself. They are optimising a third-party estimate of the thing they care about, not the thing.

What the number is actually good for

Used properly, these scores are genuinely useful, in one specific way: comparison.

They are built on a logarithmic scale, which means the gap between 20 and 30 is much smaller than the gap between 70 and 80. Moving from 20 to 30 is ordinary progress. Moving from 70 to 80 is extremely difficult. Treating the scale as linear leads to badly calibrated expectations.

So the sensible uses are relative. Comparing your score against direct competitors tells you roughly what kind of company you are in. Watching your own score over six months tells you whether your link profile is growing. Screening a prospective link source tells you whether a site is established or brand new.

The one use that does not work is treating a specific number as a target, because the score can be manipulated. It is calculated from links, and links can be bought, which is why services selling "DA 50+ backlinks" exist. Those links frequently come from sites with inflated scores and no real audience.

How authority is actually built

Setting the metric aside, the underlying thing it tries to estimate, whether other people on the web consider your site worth referencing, is real and does matter. It is built in unglamorous ways.

Publish something worth citing. Original data, a tool that solves a specific problem, a thorough guide to something nobody has documented properly. People link to things they need to point at. They do not link to another general overview of a topic that already has a thousand general overviews.

Be findable by the people who might link to you. Journalists, bloggers and forum participants link to what they can find when they need it. That is a slow compounding process, not a campaign.

Fix what you already have. Broken internal links, pages that return errors, redirect chains and duplicate versions of the same page all waste signals you have already earned. This is boring work with a better return than most link building.

Give it time. A new domain has no history, and no amount of work produces authority quickly. Anyone promising otherwise is selling links.

What not to do

Buying links is the fastest route to the score and the fastest route to a manual action. Link exchange schemes, private blog networks and bulk directory submissions to sites that list anything for a fee all share the same problem: the sites doing the linking have no audience, so the links describe nothing real.

The honest summary is that authority is a lagging indicator. It follows from having done something worth noticing. Treating it as a lever to pull directly is the mistake, and it is the mistake the metric's existence encourages.