In search engine optimization, digital marketing agencies check domain authority of websites to see the value they can provide your site. Domain authority was developed by MOZ to as a search engine ranking score that predicts how well a website will rank in the search engine results. There are many factors that are used to calculate a sites domain authority including the amount of backlinks to a website. Although this authority is not used as a metric for Google to determine how your site will rank in their results, it is considered a strong metric to use as part of search engine optimization campaigns for link building and guest posting.