Link Building is the process of creating inbound links to ones own website. This can be done by reciprocal links, being listed in e-zines, newsletters, directories, search engines, etc. Link building is one of the best ways to make your site popular. There are few types of linking one of which is reciprocal links.
Reciprocal links or link exchanges is the process where two webmasters agree to show the other's link on their website. After link building when the number of sites which link to a particular site is known as link popularity which helps in the search engine ranking of a website.