Alexa Internet
A key metric published from Alexa Internet analytics is the Alexa Traffic Rank, also simply known as Alexa Rank. It is also referred to as "Global Rank" by Alexa Internet and is designed to be an estimate of a website's popularity. , Alexa Internet's tooltip for Global Rank says the rank is calculated from a combination of daily visitors and page views on a website over a 3-month period.