What is Alexa Rank?

The main Alexa traffic rank is based on the geometric mean of these two quantities averaged over time (so that the rank of a site reflects both the number of users who visit that site as well as the number of pages on the site viewed by those users)

A web toolbar service that provides webmasters with real-time Alexa site traffic data. Online: Alexa Toolbar

Alexa is a very powerful tool used to rank web site traffic. Find out how your web site traffic stacks up against all your competitors! This is one of the most accurate freely available tools to find out how well your site ranks up against millions of other sites on the Web.

Remember: "The lower the Alexa ranking number the more heavily visited the site.". 

The Alexa Rank is different to Google PR; Alexa rank websites based solely on traffic to the website. Alexa rank websites in descending order towards 0, where the most highly visited website on the Internet is given a rank of 0. At this point in time the top three ranked websites (most visitors) on Alexa are, 0 - Yahoo, 1 - Google and 2 - MySpace. According to Alexa these 3 websites get the most traffic on the Internet. Alexa Rankings vary from 1 to a billion. Every web site in the world is included in the Alexa Rank, so the scale on your Alexa ranking is constantly changing in relation to other websites on the Internet.

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