Which process is fundamental to achieving movement in animation?

The process of creating still images is fundamental to achieving movement in animation because animation relies on the concept of displaying a sequence of images, or frames, at a rapid pace to create the illusion of motion. Each still image represents a different position or stage in an action, and when these images are played in quick succession, they are perceived by the viewer as continuous movement. This technique of creating a series of images — whether through traditional hand-drawn animation or modern digital methods — is what gives life and motion to animated sequences.

While other processes such as rendering files or compression of high-resolution files may be important in the production and final output of animation, they do not directly contribute to the fundamental concept of movement itself, which is rooted in the creation of these sequential images. Additionally, adjusting sound files, while important for enhancing the overall experience of animation, does not play a part in the actual visualization of movement.