Certified Site Metrics are metrics that are directly-measured from the website instead of estimated.
The website owner has installed an Alexa Certify Code on the pages of their site and chosen to show the metrics publicly.
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.
For more information please see this explanation of how Alexa determines the number of sites linking in.
The complete list of sites linking to this site is available to Alexa Pro subscribers.
For other sites, we display the estimated number of unique visitors from up to 6 countries, when sufficient data is available (Advanced plans only).