Back Linking

BackLinks:
Backlinks (or back-links) are incoming links to a website or web page. In the search engine optimization (SEO) world, the number of backlinks is one indication of the popularity or importance of that website or page (though other measures, such as PageRank, are likely to be more important). Outside of SEO, the backlinks of a webpage may be of significant personal, cultural or semantic interest: they indicate who is paying attention to that 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. Backlinks are also known as incoming links, inbound links, inlinks, and inward links.

Search engines often use the number of backlinks that a website has as one of the most important factors for determining that website's search engine ranking.

Reciprocal Links:(You Do Not Want These)-You Only want 1 Way Links. The link to you, and you don't link back
A reciprocal link is an agreement between two webmasters to provide a hyperlink within their own website to each other's web site. Generally this is done to provide readers with quick access to related sites, or to show a partnership between two sites.