Google Analytics is a free data collection and reporting tool. It is designed to give you a complete view of every aspect of activity on your web site.
You can discover where your site visitors come from, what pages they visit, how long they stay, what they buy, how often they abandon shopping cart, or complete a successful purchase or
goal, and how often they return.
A proper analysis of this data gives you a considerable edge over your competition in the quest for top search-engine rankings and in increasing customer loyalty and conversion.