Growth is one of the primary goals for any serious website. Unless the site is a private journal, bloggers want to make sure as many people as possible are visiting. If the site is an ecommerce site, they’ll want to not only grow the amount of traffic but maximize the effectiveness of each web page, placing special emphasis on purchases. The same holds true for blogs and their subscriptions. It’s impossible to maximize the efficiency of a website without knowing how many visitors are coming on a regular basis and what they’re doing.