Tags are fired in response to events. In Google Tag Manager, a trigger listens to your web page or mobile app for certain types of events, such as form submissions, button clicks, or page views. The trigger tells the tag to fire when the specified event is detected. Tag: A tag is code that sends data to a system such as Google Analytics. When you add a new tag, you can follow the analytics and tracking ID in real time. Trigger: A trigger listens for certain events, such as clicks, form submissions, or page loads. When an event is detected that matches the trigger definition, all tags referencing that trigger will fire.