Not only can you see accurate measures of a site’s monthly search traffic, but you can see detailed breakdowns of where that traffic is coming from and what kinds of keywords are bringing the traffic. You can also see backlink information, such as which other sites are linking to the site, how often they’re linking, and how that data changes over time.
In my experience, a lot of people are more open about sharing traffic stats then you would think. You see this not just in interviews but if you peruse through the archived articles on a blog, there’s a good chance you’ll stumble upon a “blog in review” or “traffic report” post. With those stats, you can start to figure out how much traffic the site is getting today.
Web traffic is measured to see the popularity of websites and individual pages or sections within a site. This can be done by viewing the traffic statistics found in the web server log file, an automatically generated list of all the pages served. A hit is generated when any file is served. The page itself is considered a file, but images are also files, thus a page with 5 images could generate 6 hits (the 5 images and the page itself). A page view is generated when a visitor requests any page within the website – a visitor will always generate at least one page view (the main page) but could generate many more. Tracking applications external to the website can record traffic by inserting a small piece of HTML code in every page of the website.[2]