What is domain rating?
A domain rating is a metric developed to help predict how likely a domain, subdomain, or page will rank in search engine result pages (SERP). This website ranking measure is determined on a logarithmic scale, and the score ranges from 1 to 100, 1 being where all new websites start and move on up from there.
Although we don't know the exact algorithm of ahrefs' DR, it is calculated by looking at multiple essential factors, including referring domain, linking root domains, domain age, and the total number of links, into a single DR score.
Whereas a website's domain rating measures the strength of a website, there is also a DR score attributed to each web page, called page authority or page rank.