If you want your website to be rank well at search engine backlink is must, but it should be quality backlink. Getting backlink from the same site as yours by exchange the link could be one of the best method to rank high in search engine.
Hello......... Generating Quality backlink are always important for any website...A quality back links helpful for drive more traffic to your website...........
This is because if a good employee finds your site, while navigating on the internet, and like it, he will edit the google search page and place the link in the keyword which seems to be the most accurate for your website. It not magic, very simple actually.