Moz Page Authority is a grading system built by Moz. With this grading system, you will discover and have a chance in predicting the ranking which called da pa checker of a page when it appears in the search engine result pages (SERP).
To fully utilize this, the authority of the page is ranked between the numbers 1-100. The implication of this is that your page will only get a higher ranking if it has the ability to be ranked high. And this clearly opens your view to the fact that everyone can do something to ensure their pages are ranked higher.