“Authority” is everywhere in SEO conversations: “this site has high authority”, “we need to build domain authority”. But the word mixes up two very different things: scores invented by SEO tool companies, and how search engines actually decide which sources to trust. Understanding the difference saves you from chasing numbers that don’t matter.
Third-party authority scores
| Score | Tool | Scale | Based on |
|---|---|---|---|
| Domain Authority (DA) / Page Authority (PA) | Moz | 1–100 | Link profile, machine-learning model |
| Domain Rating (DR) / URL Rating (UR) | Ahrefs | 0–100 | Strength of backlink profile |
| Authority Score (AS) | Semrush | 0–100 | Links, organic traffic, spam signals |
| Trust Flow / Citation Flow | Majestic | 0–100 | Link quality / quantity |
These are useful estimates for comparing sites and evaluating link opportunities. They are not used by Google. Google has no “domain authority” number in its ranking systems, and improving a Moz or Ahrefs score doesn’t directly change rankings. Scores are also logarithmic: going from 20 to 30 is much easier than from 70 to 80.
How Google evaluates authority
Google uses many signals to judge whether a page and its source are trustworthy and important for a topic:
- Links: links from relevant, trusted sites remain a strong signal (PageRank still exists in evolved form). Quality and relevance beat quantity.
- Topical depth: a site that covers a subject thoroughly, with many interlinked, useful pages, is more likely to be seen as a good source on that subject.
- E-E-A-T: Experience, Expertise, Authoritativeness and Trust, from Google’s quality rater guidelines. Raters don’t change rankings directly, but the guidelines describe what Google’s systems aim to reward.
- Brand signals: people searching for your brand, mentions across the web, reviews.
- User satisfaction: content that actually solves the searcher’s problem.
E-E-A-T in practice
| Element | How to show it |
|---|---|
| Experience | First-hand testing, screenshots, real results, original examples |
| Expertise | Accurate, detailed content; author credentials where relevant |
| Authoritativeness | Recognized by others: links, citations, mentions |
| Trust (most important) | Accuracy, transparency, clear ownership and contact details, secure site |
Trust matters most for “Your Money or Your Life” topics (health, finance, legal), but it applies to every site.
How to build real authority
- Pick a focus. Authority is topical. A hosting company writing about servers, Linux and DevOps builds stronger topical authority than one writing about everything.
- Create content worth linking to: in-depth guides, original data and benchmarks, tools, checklists, clear tutorials with working commands.
- Build topic clusters: a pillar page plus detailed supporting articles, linked together. Internal links distribute importance across your site.
- Earn links naturally: digital PR, guest contributions to relevant publications, partnerships, being a source for journalists, listing in genuine industry resources.
- Show who’s behind the content: About pages, author information, editorial standards, contact details.
- Keep content accurate and updated. Prune or improve thin, outdated pages. See content pruning for SEO.
- Get the technical foundation right so authority isn’t wasted on crawl problems or duplicates. See technical SEO on your own server and canonical URLs.
What doesn’t build authority
- Buying links, or link schemes (link exchanges at scale, private blog networks). These violate spam policies and can lead to penalties.
- Chasing a DA/DR number with low-quality directory or comment links.
- Mass-produced content with no expertise or originality.
- Expecting old domains to carry authority by age alone. See does domain age matter.
Measuring progress
Use third-party scores as rough trend indicators, but judge success by:
- organic clicks and impressions (Search Console, Bing Webmaster Tools). See Google Search Console setup;
- the number of referring domains that are actually relevant;
- rankings for your core topics;
- branded search growth.
Quick summary
| Concept | Reality |
|---|---|
| DA, DR, AS | Tool estimates, not Google signals |
| Google’s view | Links, topical depth, E-E-A-T, trust, user satisfaction |
| Fastest legitimate lever | Genuinely useful content + relevant links |
| Biggest risk | Manipulative link building |
Related: backlink history and SEO-friendly URLs.