We're not talking about the backbones of your spines or the connectors in Lego sets here.
This article is about search engine optimization for Google, Yahoo and Bing.
Specifically to rank a web page higher on search engines and social media sites like Facebook.
The best way to build a backlink is through content marketing where you offer valuable information that other websites want to share but will gain you links in return. This can range from getting visitors to submit their email address in order to download your free ebook or course, or it could be as simple as guest posting on relevant blogs with a link back to your site.
Image Source Google