What Are Backlinks?

What backlinks are and why they matter

Backlinks sit at the heart of how search has worked for decades, so they are worth understanding properly. The idea is simple, plus the detail that separates a good link from a useless one is where the real value sits.

A backlink in plain terms

A backlink is simply a hyperlink on one website that points to a page on another. If a blog writes about your industry plus links to your guide, that is a backlink to you. The wider web is built on these links, plus search engines have used them since the late 1990s to work out which pages are trusted plus worth showing.

Why search engines care

Search engines treat a link as a vote of confidence. When a respected site links to you it is, in effect, vouching for your content. Google's original PageRank system was built on this idea, plus while the algorithm is far more complex now, links remain one of its strongest signals. They also increasingly shape how AI search tools decide which sources to trust plus cite.

Dofollow vs nofollow links

Not every link passes the same value. A standard dofollow link passes authority, often called link equity, to the page it points at. A nofollow link carries a small piece of code that tells search engines not to pass that authority, which is common on paid links, user comments plus some directories. Google now treats nofollow as a hint rather than a strict rule, plus a natural profile usually contains a healthy mix of both. There is more on this in Do nofollow links help SEO.

What makes a good backlink

Three things decide whether a backlink helps. Relevance, meaning the linking site relates to your topic. Authority, meaning the site is trusted in its field. Plus placement plus anchor text, meaning the link sits naturally inside real content with sensible wording. A link that ticks these is genuinely useful. A link that misses them is, at best, ignored.

Quality over quantity

The biggest mistake people make is chasing numbers. A handful of relevant links from trusted sites will do more for you than hundreds of weak links from random directories or link farms. This is also why bought link bundles rarely work plus often backfire. If you want to know how good links are actually earned, read How to Get Backlinks, plus for the bigger strategy see The Complete Guide to Backlink Building. Our Backlink Services team builds this kind of profile by hand for clients. To go deeper on the mechanics, What is link building in SEO is a useful next read. Internal links vs external backlinks: what matters more explains how these fit alongside your own internal links.