Glossaire · SEO

Backlink

A backlink is a hyperlink placed on an external website that points to a page on your own site. To search engines, every backlink works like a vote of confidence: it signals that a third party considers the linked content useful, relevant or authoritative. Backlinks have been one of Google's core algorithmic signals since the origin of PageRank and remain a major ranking factor in 2026. Their value does not depend on quantity alone: the topical relevance of the source site, its authority, the nature of the anchor text and how natural the overall link profile looks matter far more than raw volume. A backlink earned from a recognized domain in your industry passes more value than a multitude of links from unrelated or low-quality pages, which Google sometimes penalizes.

How a backlink works

When a site publishes a link to one of your pages, search engine crawlers like Googlebot follow that link as they explore the web. They interpret the citation as a recommendation: the more links a page earns from trustworthy sources, the more credible it is judged to be. This is the historical principle of PageRank, still active at the heart of the algorithm. The value passed along, sometimes called link juice, flows from page to page across the web.

Not all links are equal. A dofollow link passes authority, whereas a nofollow link asks engines not to follow it for ranking purposes. The anchor text, the clickable wording, also gives semantic context about the linked content.

Why backlinks matter

In 2026, backlinks remain one of the three pillars of search optimization, alongside content and technical SEO. They directly influence authority scores such as Domain Rating or Trust Flow, and shape a page's ability to rank for competitive queries. A natural, varied and gradual link profile inspires confidence; conversely, a sudden surge of artificial links exposes you to algorithmic penalties.

A concrete example

A local agency cited in a regional press article earns a high-quality editorial backlink. That contextual link, coming from a trusted domain, is worth more than fifty links placed in unrelated directories.

Key takeaway

A backlink is a vote of confidence. Always favor the relevance and authority of the source over the raw number of links.

Acquiring quality links is part of a structured approach that LUWIZ manages for its clients.

FAQ

Questions fréquentes

There is no magic number. Quality matters far more than quantity: a few links from relevant, authoritative domains beat hundreds of poor ones. The right volume depends on how competitive your target keywords are.

No. A backlink's value depends on the source site's authority, its topical closeness to yours, the anchor text used and the link attribute (dofollow or nofollow). A relevant editorial link passes far more value than an automated one.

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