contextual links

Suppose I'm writing a blog and I quote some particular fact that I read on another web site.  As a courtesy to my reader, I insert a link within my text back to the reference I'm using.  The link will be attached to a 'keyword'.  Hence, the name contextual.  Google uses these contextual links and the keyword to measure popularity of the referenced web page.  The referenced web page calls the contextual link a 'inbound link'.  Hence, many SEO Experts refer to inbound link campaigns.