Referring Domain
The count of distinct websites that link to you at least once — a measure of how many independent sources consider you worth mentioning.
Analogy Mental model
Ten different people each writing you one recommendation letter beats one enthusiastic friend writing ten. Search engines read the numbers the same way.
In practice What you actually do
In Ahrefs or Semrush, read referring domains alongside total backlinks rather than instead of them. If the link count keeps climbing while the domain count stays flat, you are accumulating repeat links from a handful of sites, which signals an arrangement rather than a reputation.
Where people get burned Pitfalls
When most of your links trace back to one partner's site, the profile looks engineered. Diversify on purpose, before an algorithm makes the decision for you.
This entry was written in English from the Chinese original, not machine-translated. Read the Chinese version →