What is DA in SEO?

Domain Authority is a score (on a 100-point scale) developed by Moz that predicts how well a website will rank on search engines.     

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

Domain authority (DA) is a metric, developed by SEOMoz, to predict the ability of a website / domain to rank in search engines. Domain authority uses a 0 to 100 logarithmic scale. A high Domain authority score means your complete website / all the pages on your domain have the potential to rank well in search engine results.

Domain Authority: It is the term created by MOZ to rate a website in search engines .The higher the score the higher will be website place in search engines.

DA is Domain Authority which calculate by number of linking root domain, number of total links and dozens factors.