Cat purring has become a staple sound online because it is instantly recognisable and needs no explanation, appearing in pet videos, relaxation playlists, ASMR compilations, and meme edits across social media. Creators use the steady rumble to signal contentment, comfort, or a sleepy, affectionate mood, often layering it over footage of cats, cozy rooms, or slow-paced clips, and pairing it with cat laugh moments in pet compilations. Its popularity endures because the sound feels authentic and soothing, making it a reliable shortcut for warmth in short-form video, livestreams, and background audio.