Alexa is one of the most important online directories of websites. It crawls and ranks websites according to their popularity, based on a variety of factors. It also categorizes the websites based on the topic of the website, so that category-wise rankings are available. In addition to this, Site Alexa tool gives you a comprehensive SEO report of your website. The report not only covers the present state of your website, but also offers extensive suggestions on how to improve your website’s SEO friendliness. It’s a powerful tool, which if used effectively, can push your search engine rankings exponentially.