Backlinks are incoming links that refer to all links from other websites referencing the website in question. Search engines interpret a link to a website (backlink) as a recommendation for it and are geared towards providing search results from other such authoritative recommendations. The more authoritative you are on your topic, the more recommendations you will receive. In some industries, the more backlinks a website has and the better those links are, the further up the referring domain will appear in the search results. An example of strong backlinks would be links from topically relevant websites.