Domain Authority is a search engine rating metric created by Moz. DA rating is a score between 0 and 100 and this score calculated by evaluating a ton of different metrics some of which are; Moz’s very own MozRank, MozTrust, linking root domains, number of total links (similar to Trust Flow and Citation Flow). All these factors and more make up a site’s DA the higher the score the more authority that domain has (higher = better). DA is a predictor of how likely a website will rank. Now websites have a single score to compare themselves against other websites.