Directory submission is a procedure of adding webpage or website URL to a web catalog. directory submission are most reasonable type of dofollow third party referencing. High page rank dofollow directory site can expand the perceivability of a site in internet searcher results pages (SERP).
Dofollow link - the dofollow links are connections that consider focuses, pushing ‘link juice’ and boosting the pr of the connected to sites, helping them go higher in the internet searcher results pages.