Domain Authority is calculated by evaluating multiple factors, including linking root domains and total number of links, into a single DA score. This score can then be used when comparing websites or tracking the "ranking strength" of a website over time. Domain Authority is not a Google ranking factor and has no effect on the SERPs.
As of the Domain Authority 2.0 update in early 2019, the calculation of a domain's DA score comes from a machine learning algorithm’s predictions about how often Google is using that domain in its search results. If domain A is more likely to appear in a Google SERP than domain B is, then we would expect domain A's DA to be higher than domain B's DA. Learn more about the Domain Authority update and how to discuss it with your team with this presentation, or explore how to use DA 2.0 metrics with this comprehensive whitepaper.
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