Every website that wants to better understand its visitors and how to convert them uses some sort of analytics program. In our case its Google Analytics.
Once logged in (requires GMAIL Account - Free) you see your "Dashboard" that allows you to select the URL of choice (you can add as many as you like). You can then access "Main" navigational links with "Sub" links. Main links include: Intelligence, Visitors, Traffic Sources, Content and Goals.
Each main link has its assigned "Sub" links that show various statistical data and perform certain functions. For example by clicking on "Traffic Source" you would see various "Sub" links ranging from Overview, Direct Traffic, Referring Sites, Search Engines and several others. The information is neatly displayed in graphs and charts each with specific data sets and tools to help you better manage and optimize said data (function).
Just recently Google updated the way you can analyze your data. What used to be charts and graphs is now presented visually. Until you actually see the data versus reading the data you can't truly appreciate how better to design your layout, position call to action buttons/lead forms and other key items.
Website owners usually assess these data sets with the intention of hopefully increasing their conversion rate and ROI (return on investment). What better way to determine design and development strategies than seeing it ... literally. Although still in "Beta" it definitely will be a value add for webmasters. Thanks Google!