QUOTE(Boris Cain @ Apr 2 2013, 01:07 PM)
Alexa is one of the leading internet statistics engines. It keeps a "top billion
" chart, where every webpage on the planet has its place. Beginning with Google and Facebook, it goes all the way down to the gazillionth site no one knows about. It's a chart that gives you insight on how your business is doing through calculating the popularity of your site.
This traffic is based on such parameters as reach and page views. The reach refers to the number of Alexa users who visit a particular site in one day. Page view, as its name shows, is the number of times a particular page (URL) is viewed by Alexa users. Alexa.com makes it clear though that, if a particular user visits the same URL multiple times on the same day, all those visits will be counted as one. - See more at:
Alexa is a ranking system which measures the traffic of a website. Alexa traffic ranking is calculated according to its algorithm.