Domain Authority (DA) is a search engine ranking score developed by Moz that predicts how likely a website is to rank in search engine results pages (SERPs).

DA scores range from 1 to 100, with higher scores corresponding to a greater ability to rank. It's calculated by evaluating multiple factors including linking root domains and total number of links.

For guest posting and link building, targeting sites with higher DA (60+) typically results in more powerful backlinks that can boost your own site's authority.