Link juice is a search engine optimization term that loosely describes how much page rank is passed onto a hyperlinked webpage. Both internal links, links that point to another page on the same website, and external links, links that point to a completely different domain, pass link juice. Search engines use these hyperlinks to rank a webpage via an algorithm that calculates how many other webpages link to it, the content of the link's text, and the contextual content surrounding it in relation to the target webpage. The term is a bit silly because "juice" is a metaphor for squeezing juice out of something. Like juicing an orange, the web squeezes juice out of a referral link. Some oranges are ripe and delicious, while others are moldy and gross, just like webpages.