What is a backlink?
A hyperlink from one website to another, treated by search engines as a signal of authority and relevance.
Also known as: inbound link
A backlink is just an inbound link, but the term carries 25 years of SEO weight. PageRank, Google's original ranking algorithm, treated each inbound link as a small vote of confidence; the more (and the more authoritative the linkers), the higher the linked page tended to rank. The algorithm has evolved, but link signals remain one of the strongest correlates of organic ranking.
Not all backlinks are equal. A link from a major news site or a topically authoritative source counts for far more than a link from a personal blog with no traffic. nofollow, sponsored, and ugc rel attributes signal to crawlers that the link should not pass authority. Spammy or bought links can trigger penalties; the line between "outreach" and "link buying" is exactly as fuzzy as it sounds.
For brand monitoring, backlink analysis serves two purposes. It surfaces who is talking about you (a citation without a link is harder to find but a backlink is recorded by services like Ahrefs and Majestic). And it surfaces opportunities: pages that mention your brand without linking, broken links to your site that you can ask to be restored, and competitor backlinks you can pitch for yourself.
In the wild
- A startup pitching a TechCrunch reporter to earn a backlink from a launch story
- A backlink audit catching a sudden spike in low-quality inbound links and disavowing them before they hurt rankings
- A "broken link building" outreach campaign offering to replace a 404'd competitor URL with a working equivalent