Here is a small introduction provided by Google into what its Analytics program really is:

What's Analytics?

Google Analytics is the enterprise-class web analytics solution that gives you rich insights into your website traffic and marketing effectiveness. Powerful, flexible and easy-to-use features now let you see and analyze your traffic data in an entirely new way. With Google Analytics, you're more prepared to write better-targeted ads, strengthen your marketing initiatives and create higher converting websites.

Google Analytics allows you mainly to keep track of who visits your website. You can:

  • analyze your traffic by country 
  • view your traffic sources (how someone gets to your site)
  • see how much time people spend on your site
  • see how many times each specific page is viewed
  • see the languages, browser and operating system, flash version, screen resolution [and more] of your visitors.

Click here to go to Google Analytics' official tour page 
Sign in to your analytics account here (using your Google account).

The gadget spec URL could not be found