What does it mean to be a professional SEO company?

A professional SEO company optimizes your website for search engines - making it "relevant" to your target keyWords and more "important" than other similar websites - to achieve the best possible search engine ranking it can achieve as a website. Since search engine algorithms are continuously changing and the search engines, like google, refuse to share exactly how their algorithms work, a professional SEO company is compelled to provide the strongest optimization possible for your website. SEO companies do not control the search engines, therefore cannot guarantee a specific ranking.