is a method in ga.js record user-interaction with web element attach method call to paticular UI element pageview calculation unaffected Setup: _trackEvent(category, action, opt_label, opt_value, opt_noninteraction) Ex: _gaq.push('_trackEvent','Videos','Download','Gone with wind'); Category: required, appear in event report the group name of the objects we want to track Actions: In report actions are listed independently from parent category Unique event is affected by unique action name unique event per category-action pair difference in "top action" and "category action" report Labels: not required can provide additional dimension in report Values: not required, integer value, NOT negtive value Non-interaction events: If set this attribute to True, means this user-interaction does not counted as an interaction on this page. So if the visit ends from this page, the page is considered "boun...