What it means
Referring domains counts the distinct websites linking to yours, once per site. It sits alongside total backlinks, which counts every individual link, and the two figures diverge sharply: a site with 4,000 backlinks from 60 referring domains has a very different profile from one with 4,000 from 900. The domain count is the more informative of the two.
Why the distinction matters
Search engines treat repeated links from the same source as substantially one endorsement, so the twentieth link from a site adds little. That makes the number of separate sites a better proxy for how widely the content is regarded than the raw link total. When a listing quotes a large backlink figure without the domain count, the omission is usually the point.
What a buyer examines
The shape of the growth, first. Links accumulating steadily over years read as earned; blocks appearing in a single month read as purchased, and purchased links are a liability that transfers with the site. Then relevance, since links from unrelated subjects carry little weight and a profile full of them suggests a network rather than an audience. Then the specific sources, because a handful of respected sites in the niche is worth more than hundreds of directories.
The proportionality test
The useful question is whether the link profile explains the rankings. A site ranking well with very few referring domains is either in an uncontested niche, which is fine, or holding positions for reasons that will not survive an update, which is not. A buyer who cannot account for the rankings prices in the risk, so a seller with a genuinely earned profile should present it in detail.
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