This is a companion piece to the Google Analytics module.
Google Analytics is a free service that tracks users, demographic, and statistical data. On a typical site it is easy to set up --especially in Drupal using the Google Analytics module. Under a typical set-up Google Analytics tracks a user as he/she navigates from page to page within a site. This is fine for a typical site where every action on a site requires a new page view. What if, however, the site owner wanted to track how a user is using the ajax form built into views or some other custom ajax event. Google Analytics has a control for this called Event Tracking.
Event Tracking is a way to track user interaction with out registering a page view. Using Google Maps as an example site, event tracking would allow the user to track Zoom, Drag, and View Change events without contaminating the page view statistic.