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The process of applying an Animator Controller to a GameObject in Unity involves using a visual and intuitive method that helps you manage animations easily. Dragging the Animator Controller from the project window onto the GameObject in the Inspector is the most straightforward way to link the controller to the GameObject. This method allows developers to quickly assign the desired Animator Controller to their GameObject without navigating through multiple menus, making it both efficient and user-friendly.

When you drag the Animator Controller onto the GameObject, Unity automatically creates an Animator component on that GameObject if one does not already exist. This saves time and ensures that the Animator Controller and the GameObject are properly connected, allowing for immediate use of the animation logic defined within the Animator.

Other methods, such as selecting from the GameObject menu or adding components through right-clicking, may lead to a more complicated workflow or require additional steps, making the direct drag-and-drop method a preferred choice for implementing animation functionality in Unity.