In the early days of link building, unscrupulous webmasters used “link farms” to increase their inbound links in a fast and easy way. Today, no one expects such a shady tactic to work -- it’s a known fact that quality matters. If you can get websites with authority to link to your site, that’s gold -- not just from an SEO standpoint, but as a source of quality traffic as well. That’s why any link building service must focus on link authority.
Not only must your links come from websites that are well-respected and have authority, but they must also come from sites that are relevant to your industry. Any SEO provider that gets you backlinks from a well-known website that has absolutely nothing to do with your industry is simply not getting the job done.