Alexa rank is a service provided by a company recently acquired by Amazon. The original website was started back in 1996 but became a subsidiary of Amazon in 1999. It ranks websites according to the number of unique visitors and the number of page views in the last 3 months. It is a generally a popularity list for websites. If you want to know your Alexa rank all you have to do is access their official website, type your sites name and hit enter. They provide information on more than 30 million websites.
How does it work
You may now be wondering how they actually gather all this information. For a while they solely used a toolbar that had to be installed to the browser to collect and send information. As of 2008 they also acquire information from browser extensions. These browser extensions collect data from all the various users and send it to their website where it is analyzed and a complete report is produced. They have about 25,000 different browser extensio...