A backlink is a tool of linking a page to other external websites. Backlinks are often used in SEO (Search Engine Optimization) to help improve rank and discoverability in a search engine. A Backlink is also known as an inbound link. Backlinks we’re popularized by Google’s search engine that required backlinks to be discovered. Arguably still a very popular aspect of Google’s ranking, backlinks have been reduce in value due to significant misuse by “Black Hat” SEO’s in the early 2000’s.