A referring domain is an external website that links to your own, sending traffic and signalling credibility to search engines. Each unique domain acts as a vote of trust, helping search algorithms understand the authority, relevance, and reliability of your content.
In B2B SEO, the quality of these domains is far more important than quantity. Links from respected industry publications or thought leaders hold significantly more weight than links from low-quality sites.
Monitoring referring domains helps marketers identify which partnerships, PR efforts, content collaborations, or organic mentions are contributing to domain authority. A strong and diverse backlink profile improves visibility across competitive search terms, increases organic reach, and supports long-term SEO performance. Over time, referring domains become a key indicator of how well a brand is recognised and referenced across its category, reinforcing both trust and discoverability.