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And while this takes some of the control of your site's performance away from your site, it also allows you to get help from Seo services companies. An SEO service's job is to see that your website is ranked highly in the search engines for competitive keywords. They do this through a variety of methods, including improving on page criteria. But the technique considered most important in SEO is probably link building. Link building is simply a method that SEO services use to build backlinks to your site.