Cat purring has long been recorded and shared online because the sound itself communicates relaxation without any words or context. Cats purr most often when content, though they may also purr to self-soothe, and listeners widely associate the low vibration with comfort and healing. Short purr clips became popular in pet videos, ASMR content and soundboards, where they can be reused instantly to soften a scene or add a cute reaction. Its appeal has lasted because it works across languages and ages, making any quiet moment feel warmer and more personal.