Backlink
A backlink is a link from another website to a page on yours, and it acts as a core trust signal in search: each one is read as a vote of confidence, telling search engines that another site found your page worth pointing to.
Backlinks remain one of the strongest ranking factors, but quality matters far more than quantity. A single link from a respected, topically relevant publication can outweigh hundreds from low-value directories or link farms. Search engines weigh the linking site's authority, its relevance to your subject, and the surrounding context, so one trusted citation often does more than a long list of weak ones.
The links that hold up are earned, not bought. Buying links or trading them in private networks is against search engine guidelines and risks a penalty that is slow and painful to reverse. The durable approach is to publish something other people genuinely want to reference: original data, a clear free tool, or a definitive guide on a narrow question. Those assets attract links on their own merit and keep attracting them over time.
It is worth being honest that backlinks are easy to misjudge. Raw counts in third-party tools include nofollow links, duplicates, and spam your competitors had no part in building, so a high number alone tells you little. Read the profile by relevance and source quality, not totals, and treat a steady trickle of links from credible sites as healthier than a sudden spike.