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In Unity's Animator Controller, the Trigger parameter is specifically designed to be used as a one-time activation signal for transitions between animation states. When the transition to a new state is initiated, the Trigger parameter is consumed and automatically reset to its default state. This characteristic is what distinguishes Triggers from other types of parameters like Bool, Float, or Int.

When a Trigger parameter is set, it tells the Animator to activate a transition immediately, but once the transition begins, the Trigger parameter is effectively reset. This allows for repeated use; for example, you can trigger an animation every time a specific condition is met without having to manually reset the parameter afterward.

On the other hand, Bool, Float, and Int parameters maintain their state until explicitly changed by your code or by other conditions in your game. The persistence in their values means they do not get reset automatically upon consumption, which is a crucial aspect of how Triggers are designed to function within the Animator Controller.