Domain Authority is a score (of 100 points) set by MOZ where you can predict the ranking that your site might get in the search engines.

Domain Authority is used to compare one site to another Or determine the strengths of a site. MOZ calculates this metric by several factors, including the links that come to your site from the root pages, the number of links that refer to your site, MozRank, MozTrust, and so on.

To determine the domain authority, MOZ programmed a system that calculates the number of metrics of the site, such as Google algorithms. It included more than 40 points for evaluation. This means that the domain is not static but is volatile. For this reason, it is better to use a domain as a competitive metric against other sites than to measure internal SEO factors.

Although the Domain Authority measures the strength of a domain hierarchy, Page Authority measures the strength of individual pages. The same is true for MozRank and MozTrust standards.