This index gives a value from 1 to 100, it is known by the abbreviation PA in the SEO world, and its value gives us an approximate idea of the potential to position a particular URL.
While Page Authority measures the strength of a single page, Domain Authority (DA) measures the strength of a domain or subdomain. In this way, the DA gives you aggregated information for the entire domain or project as a whole.
The page authority score is a very useful metric for SEO consultants that allows you to measure the potential to position a given page in search engines. However, it is a metric that can be easily manipulated and should never be considered as an end in itself.
Important: DA and PA are indexes or metrics, they are not an SEO factor taken into account by Google or other search engines. Focusing on optimizing these indicators without taking into account the SEO factors will allow you to manipulate these metrics but will not necessarily help to improve your project.