Hi,
Domain Authority (or DA) a metric that was developed by Moz. SEO service providers follow DA rank because it plays a crucial role in SEO for website high ranking. So, the more you have improved organic traffic and better rank position in search engine result pages (SERPs). 7 REALISTIC STEPS TO INCREASE YOUR WEBSITE DOMAIN AUTHORITY
Domain authority is the measure of strength and popularity of your domain in search engines. It is measured by Moz and your domain is ranked between 0 to100 depending on the popularity and trust. DA can be improved by good content update and also by building backlinks from other relevant domains.
To calculate Domain Authority, over 40 signals are taken into consideration.
Websites that rank higher on search engines tend to have a high DA.
High Domain Authority -> high search engine rankings -> more traffic.