A trigger listens for certain events, such as page loads, clicks or form submissions. When an event is detected that matches the trigger definition, any tags that reference that trigger will fire. In other words, tags fire in response to events, and in Adnuntius Connect a trigger listens to your web page for certain types of events like form submissions, button clicks, or page views. The trigger tells the tag to fire when the specified event is detected. Every tag must have at least one trigger in order to fire.