Definition: Domain Authority (DA) is a metric created by the SEO consulting and research company Moz which measures a website's likelihood to rank on search engines. "Authority" is often used outside of Moz's metric to describe a domain's relative "strength," determined in large part by their backlink portfolio.
Domain Authority is used as a predictive measure for PageRank, Google's proprietary algorithm that plays a major role in determining search engine results. Due to the shroud of secrecy around PageRank, Moz's DA metric is widely considered to be one of the best third party tools for evaluating domain strength.
Domain Authority assigns a website as a whole a numerical value on a 1-100 logarithmic scale. That means it's far more difficult for a site to move from 20 to 30 than from 80 to 90, mimicking . Thus, the highest-ranked websites sare considered far more authoritative than lower-ranked ones.
DA is created by combining more than 40 individual signals which are tracked and measured by Moz, many of which are Moz's own inventions.
The most important metrics include:
As with Google search results, a page's Domain Authority will fluctuate on a daily basis. Those relying on DA in their metrics generally track it consistently, and take drops in DA as a sign that they need to fix a problem in their SEO.
Keep in mind: Domain Authority is not an absolute measure of your website's search engine standing. Like all other third party tools, use it as a directional tool to monitor overall SEO progress. Keep a close eye on traffic and rankings; when those improve, Domain Authority should generally follow suit.
The best way to impact your website's domain authority is to institute best SEO practices. Link building, on-page optimizations, and social media marketing will slowly help a domain build authority.
When looking at opportunities to improve domain authority, consider: