Link building is one of the important SEO tactics that people who are into internet marketing should know about. Basically, link building means building back links to your website. The more number of back links are found in your website, the more it gets noticed by search engine crawlers and the more chances you get of being on top of the search engine results page. To put it simply, link building is like giving your vote of trust to a website, if many web users trust the site, then it will rank higher.