The website owner has installed an Alexa Certify Code on the pages of their site and chosen to show the metrics publicly.
There is not necessarily a link between the upstream site and this site.
Global traffic ranks of 100,000 are subject to large fluctuations and should be considered rough estimates.
If a site has Certified Metrics instead of estimated, that means its owner has installed code allowing us to directly measure their traffic.
The "Sites Linking In" count shows the number of sites that Alexa found that link to this site.
For more information please see this explanation of how Alexa determines the number of sites linking in.