In SEO, DA and PA are measure the score of your websites and webpages. Let’s see here more deep: DA: 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 (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 multiple factors, including linking root domains and number of total links, into a single DA score. Page authority is a metric, developed by SEOMoz, to predict the ability for a specific page to rank in search engines. Page authority uses a 0 to 100 logarithmic scale. A high Page authority score means your page has the potential to rank well in search engine results.