Domain Authority is a score (on a 100-point scale) created by Moz that predicts how well a site will rank on web search tools. Utilize Domain Authority when contrasting one webpage with another or following the "quality" of your site after some time.

I thinks its a number from 0-100 introduced by MOZ.

Domain Authority (DA) is a search engine ranking score developed by Moz that predicts how well a website will rank on search engine result pages (SERPs). A Domain Authority score ranges from one to 100, with higher scores corresponding to a greater ability to rank.

Domain Authority is calculated by evaluating linking root domains, number of total links, MozRank, MozTrust, etc. — into a single DA score. This score can then be used when comparing websites or tracking the "ranking strength" of a website over time.

You can view a website's DA by using MozBar (a free Chrome-extension), Open Site Explorer(a backlink analysis tool), the SERP Analysis section of Keyword Explorer, and dozens of other SEO tools across the web.

Domain Authority (DA) is a search engine ranking score developed by Moz that predicts how well a website will rank on search engine result pages (SERPs). ... Domain Authority is calculated by evaluating linking root domains, number of total links, MozRank, MozTrust, etc

Domain Authority (DA) is a search engine ranking score developed by Moz that predicts how well a website will rank on search engine result pages (SERPs)

Domain Authority (DA) is a search engine ranking score developed by Moz that predicts how well a website will rank on search engine result pages (SERPs)