Domain Authority (DA) is a score that predicts how well a website will rank on search engines. Referring domains play a crucial role in influencing a site's DA. The more high-quality referring domains a website has, the higher its DA is likely to be. This is because search engines consider backlinks from reputable sites as votes of confidence, thereby increasing the site's authority.

Referring domains can provide different types of links: NoFollow and DoFollow. DoFollow links pass 'link juice,' helping to improve the receiving site's SEO. NoFollow links, on the other hand, do not pass link juice but can still drive traffic and enhance visibility. Both types of links are important in a well-rounded backlink profile.

Link building is the process of acquiring backlinks from other websites. Effective link building strategies focus on obtaining backlinks from high-quality referring domains. This not only enhances the site's backlink profile but also boosts its credibility and search engine rankings.

Anchor text is the clickable text in a hyperlink. The choice of anchor text used by referring domains can impact the receiving site's SEO. Relevant and descriptive anchor texts can improve the relevance of the linked content, thereby aiding in better search engine rankings.

Regular backlink analysis and audits are essential to understand the quality and impact of referring domains. Tools for backlink analysis help in identifying which referring domains contribute the most to a website's SEO. Backlink audits are periodic reviews to ensure that the backlinks are from reputable sources and do not harm the website's credibility.