Link juice is the currency of the value of backlink.Each link acts as a recommendation or a vote.The total value of link juice that comes in a web page demonstrates its authority and reputation.
Link juice is the comparison between couple of sites, google judges the better by counting links from other sites to one is getting.
Link juice is a term that was first coined by Greg Boser. Link juice can be called a thing that is considered by Google to rank websites. Link Juice is very important aspect taken into consideration by Google for ranking a website. More inbound links a site has, more it receives link juice. Strong inbound links help a website in getting on the top of a Search Engine Result Page
Link juice is the currency of Google. In other words, it’s the secret sauce that allows you to beat your competitors for rankings in Google. Sure, there are some other factors that Google uses to calculate rankings (see Search Engine Optimization), but link juice is by far the most important aspect of dominating Google and in order to understand Google, you have to understand link juice.