What is PA and DA

PA(page authority) & DA(Domain authority).

PA describe the probability that a specific page from your site will be found on the search engine. Higher PA means greater chance of your page showing up on the search engines.

DA is very important for a website because it will help new pages of content (including blog posts) get indexed more quickly and have a better chance of ranking prominently in the search results.

Domain Authority vs. PageRank

There are a few key differences between these two ranking systems.

• Domain Authority is actively used, while PageRank has fallen in utility.

• Domain Authority is closely related to Page Authority, which measures individual pages. PageRank only covers the overall site.

• PageRank is calculated by Google itself, while DA is a third party calculation.

• PageRank is not a direct influencer of your SERP ranking, while DA can be used to measure that relationship.

• PR is limited to measuring the influence of links, while DA includes a wider range of metrics.

• DA updates several times each month, while PR does not.

• PR is measured on a scale of 0 to 10, while DA is measured on a scale of 0 to 100, making DA more accurate for similar sites.

• DA is being improved over the months as Moz refines the algorithm powering it, while PR is decreasing in value as Google shelves it.

Domain Authority is affected by many of the same things that affect your SERPs position and your user engagement, which makes sense. DA is a measurement of your SEO, popularity and engagement. Better metrics all around will increase your Domain Authority.

Keep in mind, also, that Moz offers the same calculation on a page level as well. Where DA and PR only work on the site itself, going by the domain, Page Authority works on the individual page. This can be a good way to analyze the breadth of your site. Which pages have low authority and are keeping your ranking down? Which pages have high authority and what are they doing right? When you analyze your site in this light, you can see even more value in the metric.

The bottom line is that Domain Authority is a more active, up to date metric that ranks a site in a more granular way. A higher DA is better than a higher PR, particularly now that Google is pulling back on its investment in PR