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Quaternions are indeed used to represent rotations, which is a fundamental concept in computer graphics and game development. They provide a way to encode rotation in three-dimensional space without suffering from problems like gimbal lock, which can occur with Euler angles. Quaternions consist of four components (one real and three imaginary) that combine to represent a rotation around an axis by a specified angle.

Quaternions allow for smooth interpolation between orientations, known as "slerp" (spherical linear interpolation), making them particularly useful for animations and camera movements. This capability is essential for creating fluid and natural motion in games, where accurate and smooth transitions between different orientations are often required.

The other responses stem from varying positions on the usage of quaternions. While context can sometimes dictate the preferred method for rotation representation, quaternions remain a standard approach in Unity and other 3D engines for most use cases involving 3D space. Therefore, the assertion that quaternions are used to represent rotations is universally accepted as true within the scope of game development and computer graphics.