The Relative Importance/Visibility of a Webpage
SEOmoz's Page Strength tool is intended to serve as an alternative to Google's PageRank score in the toolbar, offering insight into how valuable, important and popular a site or page is as compared to others on the web.
SEO is the active practice of optimizing a web site by improving internal and external aspects in order to increase the traffic the site receives from search engines. Firms that practice SEO can vary; some have a highly specialized focus, while others take a more broad and general approach. Optimizing a web site for search engines can require looking at so many unique elements that many practitioners of SEO (SEOs) consider themselves to be in the broad field of website optimization (since so many of those elements intertwine).