Domain Authority (DA) is a search engine ranking score developed by Moz that predicts how likely a website is to rank on search engine result pages (SERPs). The score ranges from 1 to 100, with higher values indicating a greater ability to rank. DA is calculated by evaluating multiple factors, including the number and quality of inbound links, linking root domains, and other signals. While not used by Google itself, Domain Authority is widely adopted by digital marketers and SEO professionals as a comparative metric to assess the strength and credibility of a website relative to its competitors.