If a site has Certified Metrics instead of estimated, that means its owner has installed code allowing us to directly measure their traffic.
The more traffic a site gets, the more data we have to calculate estimated metrics.
Learn more about Alexa's Data Unique Visitors and Pageviews The number of people who visit this site and the number of pages they view.
Site owners who install the Alexa Certify Code on their website can choose to display their Certified Metrics, such as Monthly Unique Visitors and Pageviews, if they wish.
Estimates are more reliable the closer a site is to being ranked #1.
Global traffic ranks of 100,000 are subject to large fluctuations and should be considered rough estimates.