The more traffic a site gets, the more data we have to calculate estimated metrics.
Estimates are more reliable the closer a site is to being ranked #1.
Those links are very important, because search engines and the users are reaching those links. Alexa rank is a scoring framework that measuring an activity and making characterization as per this movement those Alexa Toolbar clients are going to sites.The website owner has installed an Alexa Certify Code on the pages of their site and chosen to show the metrics publicly.Not all websites implement our on-site analytics and publish the results.Other wise this will affects your website negatively.It's very important to use pictures on your website to bring up the main concepts of your website. Search engines understand the pictures by their alt tags.