Purring is a soft, vibrating sound that many cats make when they are content or relaxed. It usually occurs when they are being petted, resting, or enjoying their surroundings. The sound is produced by the rapid contraction and relaxation of the muscles within a cat's larynx, creating a soothing rhythm that can be comforting to both the cat and its owner. Interestingly, purring is not just a sign of happiness. Cats may also purr when they are in pain, scared, or healing, as the vibrations can promote relaxation and even help with recovery. This unique behavior makes purring a fascinating aspect of cat communication and well-being.