Which is the most powerful backlink?

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A backlink's full potential is only achieved when it comes from an authoritative site that is in some way relevant to your industry and has built trust with their audience. Search engines like Google consider backlinks as a trust signal, so links to your site from high Domain Authority (DA) or Domain Ratings (DR) domains such as news sites, industry-leading blogs, and government (.gov) and educational (.edu) sites are most important. A backlink needs to maintain its  relevance to the site it links to because links from sites that share the same niche enhance topical authority and  when placed naturally within valuable content (instead of spammy or unrelated pages) the SEO impact becomes  stronger. Dofollow links transmit link equity more effectively than nofollow links which makes them generally  more valuable.