What is DA and PA?

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.
 
Whereas Domain Authority measures the predictive ranking strength of entire domains or subdomains, Page Authority measures the strength of individual page. The same is true for metrics such as MozRank and MozTrust. If you ever forget what domain authority is, you can also just hover over the column to get a refresher.
 
Page Authority (PA)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.

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.
 
DA Stands for domain Authority while PA stands for Page Authority. As per my understanding, please check the below given difference between the DA & PA. Whereas Domain Authority measures the predictive ranking strength of entire domains or sub-domains while Page Authority measures the strength of individual pages.
 
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