Backlinks, also known as incoming links, inbound links, inlinks, and inward links, are incoming links to a website or web page. In basic link terminology, a backlink is any link received by a web node (web page, directory, website, or top level domain) from another web node. source Wikipedia.
This is the third part of the series and if you dont have the first two here they are:
Back links are important for you to appear in the search engines and build authority for your site.
with out much ado here is the list of list no. 3