There are a number of ways that a company can investigate whether their website is doing well regarding visitors and traffic and often a website needs to have some tracking data installed within the website's code in order to track visitors. In addition, if a website owner decides to buy visitors, the company providing the results will usually offer some sort of tracking options for the website. And there are generally some interesting statistics available through those interfaces such as when visitors came to the site, how many times they visited and from what URL they clicked through.