Unlike Google Page Rank, Alexa Traffic Rank is a metrics to show website traffic. While Page Rank shows the quality of sites in terms of backlinks, good content, bookmarking and other SEO terms; Alexa traffic rank shows total number of unique visitors on a websites. Higher rank denotes less visitors while low indicate more visitors. For example Google has 1 Alexa Rank as it is the most visited websites in the world even more than Facebook.
Alexa traffic rank goes up to billions and lists all websites in orders on the basis of regular visitor’s visit on the site. It registers site’s ranking on a global scale and gives two different ranking, one is global and second is in a country ranking. Global Alexa ranking shows your place among all websites and in country ranking it marks actual place in a specific country.