Google Analytics is absolutely free and there are many benefits that come with installing it on your site. It allows tracking your website easily and with lots of data. Google Analytics shows you how people found your site, how they explored it, and how you can enhance their visitor experience. With this information, you can improve your website return on investment, increase conversions, and make more money on the web.To start using Analytics, sign in http://www.google.com/analytics with your Google Account and get Google Analytics UA number for your domain. For the installation of Google Analytics you should put UA number. You can get it in your Google Analytics account. The format is UA-XXXXX-YY. Choose Code placement - Top or Footer. Code will be put after <body> for Top, and before </body> for Footer. You can learn more about Google Analytics here.