Important pages receive a higher PageRank and are more likely to appear at the top of the search results.
PageRank works by counting the number and quality of links to a page to determine a rough estimate of how important the website is.
A site's ranking is based on a combined measure of Unique Visitors and Pageviews.
Pageviews are the total number of Alexa user URL requests for a site.
Similar to many other websites like Alexa, Netcraft features a toolbar that provides users with the ability to view page-hit popularity and various web server metrics along with aggregated user provided website feedback.