Backlink

A backlink (also called an inbound link or external link) is a hyperlink on another website that points to your web page. Backlinks are one of the most important SEO ranking factors — Google interprets a link from a reputable site as a "vote of confidence" in your content. The quality of backlinks (authority of the linking site, relevance, anchor text) matters more than quantity. Building high-quality backlinks is central to off-page SEO.