Backlinks (inbound links, incoming links, inward links and inlinks) are hyperlinks that point towards your web site/blog from other domains all around the web. These links are one of the most important factors when it comes to search engine optimization (SEO) and will help your site achieve a higher rank on search engine result pages (SERP). Simply put, the more high quality links you have pointing back to your site, the more popular search engines will deem your page, helping your site rank higher on Google, Bing, Yahoo and more!
Backlinks are essential in SEO
Backlinks are important because they are an indicator of your website's importance or popularity. They are only a fraction of what SEO is all about but they play an important role, and they are the bread and butter of internet marketing.
Another important factor of any backlinks you have pointing to your site is the anchor text. This is the actual text that is linked to your site. Links placed on related sites that use an anchor text that is relevant to your sites content are what you are looking for, and the better ranked the page the link is coming from the better. (Ref: http://sitowebinfo.com/back/)