Originally Posted by torka
A slang term used to describe the amount of value or weight a link can pass along to a target document in various search and ranking algorithms which take linking patterns into account when determining whether (and where) to display the target document.
Right. Also I am adding some point if the link is nofollow then it will not any link juice. May be it will impact on your ranking if the link is from high authoritative site but it won't pass any link juice. Also How much juice it will pass if it is dofollow depends on several factors such as the relevancy of the link and the quality of links pointing to the page where the link came from. Hope it will helps you. Thanks.