Link Juice is the term used for how much benefit a link passes on, as not all links are equal.
A link is assumed to pass more link juice if
1. It does not have the no-follow attribute added
2. The page the link is on is indexed by the search engines
3. The number of links on the page that the link is on are low
4. A page with a higher moz-rank and moz-trust is likely to pass more link juice
A good linking architecture to ensure all documents in the website gets a good link juice.It is very beneficial for search engine ranking of a website.
Link Juice is very important for a website because it increases the visitors to a website and also improves your keywords' visibility in search engine results.
Link Juice is beneficial for a website because it helps in achieving high ranking in search engine results as well as for increasing the page rank of a website.