As usual, John Mueller from Google took part in the Q&A game on Twitter by clarifying the Domain Authority score of a site.
The initial question asked on Twitter by a user is whether a backlink
from sites with a high domain authority was important in the Google ranking.
In this statement, John Mueller plays on words. Indeed, it is logical
that the Mountain View company does not integrate the score of a third-party tool into its algorithm, but it is worth remembering that it always uses Page Rank to assess the authority of a site.
This PageRank score not being communicated publicly since 2016, the Domain Authority is considered by many consultants as the measurement tool that comes closest to it. It is therefore advisable to keep an eye on it when going hunting for backlinks.
What is the Domain Authority?
Developed by SEO software company Moz, the Domain Authority is a search engine ranking score that predicts a website’s ability to rank in search engine results pages (SERPs). The Domain Authority ranges from 1 to 100. The higher your score, the better the ranking of your website. To calculate the domain authority of a website, Moz takes into account more than 40 factors, such as the root domains and the total number of inbound links. Websites with a large number of high quality inbound links, like Wikipedia, have the highest domain authority. New websites with little to no inbound links usually have one domain authority.
Moz’s domain authority scale is also logarithmic, which means that when your Domain Authority is higher, it is more difficult to improve your score.
For example, it’s more difficult to get your Domain Authority from 70 to 80 than from 20 to 30.
Note that the domain authority of your website may decrease if another
site sees its Domain Authority score increase. Even if you don’t lose backlinks , Since Moz cannot give high authority websites a domain authority rating of more than 100, it maintains its rating at 100 while decreasing the domain authority of other websites. In other words, the domain authority of your website is relative to that of the website of the highest authority.
Domain Authority vs PageRank
The Domain Authority is not an official measure of Google. It was created by Moz, which is one of the leading SEO tools in the world and is used by many SEO agencies and consultants to replace Page Rank.
Page Rank is the official measure of the authority of a website, created and used by Google in its own algorithm. It works in the same way as the Domain Authority, on a scale of 0 to 100, and is calculated by the number and quality of the backlinks pointing to a domain.
By releasing the Page Rank figures, Google has given website owners
inside information on how Google views their site and has allowed marketers to make their way to the top of search results. Unfortunately, this also led to the appearance of numerous spam emails and “black-hat” SEO techniques which ultimately led Google to stop communicating Page Rank scores publicly in 2016.
Google therefore always uses Page Rank in its algorithm. And although this score is no longer made public, SEOs are constantly looking for another way to measure the authority of a domain. This led all the main SEO tools to create their own versions:
Moz with the Domain Authority Majestic with Trust Flow and Citation Flow
SEM Rush with Domain Score and Trust Score Ahrefs with Domain Rating and URL Rating Although the rating system of each tool is useful and allows to measure the authority of a website, the score of Moz Domain Authority, or DA, has become the method closest to that of the Page Rank system of Google. This is why many experts in link acquisition use the Domain Authority as the preferred means to calculate the power of a domain name.