Page Authority (PA) is a score that shows how a web page is likely to rank on SERP (search engine results pages). It is calculated on a scale that goes from 1 to 100. If your Page Authority score is high, it means that you are more likely to rank well.
Page Authority looks at individual pages instead of websites as a whole. It looks at a number of factors, like data from the web index and correlations with actual rankings on multiple SERPs, to figure out where a page might rank.
Page Authority gives you information about how important a page is and how likely it is to be seen. By looking at metrics like top-ranking keywords and more, you can learn more about how well your page is doing and adjust its strategies to fit.
Recently the Page Authority metric was added to the SEO Difficulty formula making the metric scores more accurate and up to date, find more information about it in the article:
Refresh SEO Difficulty Feature
Read the following article to learn more about Page Authority and Domain Authority: https://neilpatel.com/blog/increase-domain-authority/