Page Authority is defined as a Value of a website in a simple language , If a website is of Higher Value it means it can rank on search Engines Organically.
Most of the Concerns related to Page Authority and Seo are implemented to increase the score of the website so it can rank higher on seach Engines. This concerns can be Quality Unique Content ,Backlinks and User friendly interface etc,
PA is calculated, at URL level. Page authority is a measure that tells about the authority of a URL , and it is a part of domain authority. Both DA PA checker use a logarithmic scale of 0 to 100, which deals with the relevance of links and information within the web pages. Higher PA refers to higher chances of a page to show up in Search Engine results Pages