Page authority is a metric that takes values from 0 to 100, and uses the same methodology as domain authority, in order to predict how that page will perform on Google search, based on the number and quality of backlinks it receives from other pages (internal or external).
What is Page Authority and why does it matter?
Page authority is a metric closely associated with domain authority. The first one measures the strength of a single web page, while the second uses the same methodology to rate an entire domain. Page authority is used to evaluate web pages in order to determine their relevance. The factors that influence page authority are similar to those used to determine domain authority:
The number of internal links pointing to the web page (from other pages in the same website). This is why linking your pages is so important.
The number of external links pointing to the web page (from other websites)
The quality of the domains associated with external links, which can be divided into “general domain authority of linking domain” and “relevance of the linking domain”
On-page SEO interventions do not influence page authority.
Page authority is a strong signal of which pages on a website are the most important. Many times, the homepage of an established website will most likely boast a higher page authority than other pages on it. At the same time, if other pages get a lot of backlinks of their own, they may come close to the page authority of the homepage. New web pages usually don’t rank high in terms of page authority straight away. Like domain authority, page authority needs time to grow gradually. More popular web pages, with a proven track record of reliability, are therefore more likely to score higher in the page authority metric.