What is: Page Authority
Page authority (PA) is a metric created by Moz that is used to measure the authority of a given web page.
It is a score from 0-100 that reflects how important a page is to Google’s ranking algorithm. The higher the score, the more likely it is that the page will rank high in search engine results pages (SERPs).
PA is determined by evaluating a number of factors, including the quantity and quality of links to the page, the relevance of those links, and the age of the page.