SEO

Backlink

Definition

What is Backlink?

Inbound link from another website. Historically the strongest ranking signal in SEO. Still important, though structured data and entity signals have closed some of the gap in 2026.

Related terms

Cross-linked concepts

Domain Authority

Third-party score (Moz, Ahrefs equivalents) estimating a domain's overall ranking strength based on backlink profile and historical performance. Not a Google signal directly, but correlates with ranking outcomes.

Same category

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