What Is Domain Authority?
Quick Definition
Domain Authority (DA) is a search engine ranking score developed by Moz that predicts how likely a website is to rank in search engine result pages, scored on a scale from 1 to 100.
Domain Authority is a metric created by Moz, an SEO software company, to estimate a website's ranking potential. It analyzes factors like the number and quality of backlinks pointing to a domain to generate a score from 1 to 100, with higher scores indicating greater ranking ability.
It's important to understand that Domain Authority is not a Google ranking factor. Google does not use Moz's DA score in its algorithm. However, DA is useful as a comparative tool to evaluate the relative strength of websites. It helps SEO professionals prioritize link building targets, assess competitors, and track their site's authority over time.
DA is calculated using a machine learning model that considers linking root domains, total number of links, and other factors. New websites start with a DA of 1, while the most authoritative sites like Google, Facebook, and Wikipedia have DAs close to 100. Most small business websites fall in the 20-40 range.
Similar metrics exist from other SEO tools: Ahrefs has Domain Rating (DR), SEMrush has Authority Score, and Majestic has Trust Flow. While the specific calculations differ, they all attempt to measure the same concept: how authoritative a domain is based on its backlink profile.
Why It Matters
Domain Authority gives you a benchmark to measure your website's competitive position. If your DA is 25 and your top competitors are all above 50, you know you need to significantly invest in link building before you can compete for their keywords.
It also helps you evaluate link building opportunities. Getting a backlink from a DA 70 website is far more valuable than one from a DA 10 website. Understanding this helps you focus your outreach efforts where they'll have the most impact.
Real-World Examples
A startup tracked their DA monthly and saw it grow from 12 to 38 over 18 months through consistent content marketing and PR outreach, correlating with a 200% increase in organic traffic
A marketing agency used competitor DA analysis to show a client why they needed to invest more in link building: competitors had DAs of 45-60 while the client was at 22
A local business focused on earning links from high-DA local news sites and chambers of commerce, efficiently growing their authority in their geographic market
An e-commerce site discovered that pages on their site with the most backlinks from high-DA domains consistently outranked their other pages
Related Terms
Backlink
A backlink is a link from one website to another. Search engines use backlinks as a key ranking signal, treating each link as a vote of confidence in the linked content.
Link Building
Link building is the process of acquiring hyperlinks from other websites to your own, which search engines use as a signal of your site's authority and relevance.
SERP (Search Engine Results Page)
A SERP is the page displayed by a search engine in response to a query, showing organic results, paid ads, featured snippets, and other specialized content.
Technical SEO
Technical SEO refers to the process of optimizing your website's infrastructure so search engines can crawl, index, and render your pages efficiently.
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