To understand that Domain Authority is a part of Google Algorithm and first we have to understand what Domain Authority is,
The concept of Domain Authority was first introduced by Moz Company,
Domain Authority or DA describes a website’s ranking score that predicts how likely a website is to appear in search engine results and rank.
Domain authority is calculated using dozens of factors, including the number of domains and the score itself on a 100-point scale.
It is worth noting that you can check the authority of any website on Moz, or the Semrush company. What is Domain Authority? How Can You Build It?