What is it Linkjuice and the difference with a backlink?

What is it Linkjuice and the difference with a backlink? - (iklangoogle = window.iklangoogle || []). Push ({}); (iklangoogle = window.iklangoogle || []). Push ({}); Linkjuice or backlink are two terms that are familiar among practitioners seo , although it has difference both are two things that are related to each other