What DA and DR measure, and what they miss.
Both metrics summarize a site's inbound link graph: how many referring domains point at it and how strong those domains are. The scale is logarithmic, so moving from 70 to 80 takes far more link equity than moving from 20 to 30. That's why high scores are scarce and why sellers lean on them so hard.
Neither metric knows whether a site has readers, whether its traffic is rising or falling, whether it quietly sells guest posts, or whether the page your link sits on is indexed. A domain can keep a high score for years after its editorial standards slip, so check organic traffic in Ahrefs or Semrush, ranking keywords and recent bylined articles too.