What is the primary function of a Collider in Unity?

The primary function of a Collider in Unity is to define the physical shape of an object. Colliders are essential for implementing physics interactions in a game, as they provide the boundaries for physics calculations. When game objects with colliders collide with each other, Unity's physics engine detects these interactions and applies the appropriate physical responses based on the colliders' shapes and settings.

This feature is crucial for enabling various gameplay mechanics, such as detecting collisions, triggering events, or applying forces when objects come into contact. Without colliders, objects would not interact physically, which is fundamental for creating a realistic environment where characters and items can interact in meaningful ways.

Other options, while important in game development, do not relate to the core function of a Collider. Sound settings, visual asset creation, and user input management serve different purposes in the Unity environment and do not involve defining an object's physical shape.