Domain Authority is a test of how well a website is possible to perform in search engine results. Domain authority is one of the main factors that determine how well your website will rank in search engines.
In the “old days”, a website was weighted based on its page-rank. Now, domain and page authority plays an important role in the ranking of any domain. By updating your domain authority, you are also increasing your chances of improving your search engine ranking. Remember of DA as a manner of measuring how competitive a website is in a Google search.