Back link is mathametically proven traffic building system

Back link is mathametically proven system building up a good number of traffic. There are lot of way to be back linked . You can link back or other people can link you back in this system . If you want to link with any search engine or website , Then you get a code to install into your site from them pest it into your html file and thats all . Some search engine linking is free and you need not to install the code they do it by there own .