However, the tool is often criticized for only being able to deliver data on a limited number of websites. This is due to how Quantcast works: website operators first need to set up a data collection feed on their website so that Quantcast can collect data and estimate traffic from then on. If a page doesn’t work, the tool cannot display matching results. Because of this, Quantcast only really offers data on large, well-known websites.
Web traffic is the amount of data sent and received by visitors to a website. This necessarily does not include the traffic generated by bots. Since the mid-1990s, web traffic has been the largest portion of Internet traffic. This is determined by the number of visitors and the number of pages they visit. Sites monitor the incoming and outgoing traffic to see which parts or pages of their site are popular and if there are any apparent trends, such as one specific page being viewed mostly by people in a particular country. There are many ways to monitor this traffic and the gathered data is used to help structure sites, highlight security problems or indicate a potential lack of bandwidth.