A backlink, also known as an inbound link, is a hyperlink that leads from one website to another. Backlinks are an important factor for search engine optimisation (SEO), as they are seen as recommendations or referrals.

Search engines such as Google use backlinks as an indicator of the authority and relevance of a website. A higher number of high-quality backlinks pointing to a website can help it to perform better in search engine results, as it is seen as more trustworthy and useful for users.