That soft, rhythmic sound your cat makes while curled up beside you might seem simple—but there’s a lot going on behind the scenes. So why do cats purr, really? Purring happens when a cat’s brain sends signals to muscles in the voice box (larynx), causing them to twitch rapidly. This movement makes a vibration as air passes through, producing that classic purr sound—both while inhaling and exhaling.
More information: https://www.pawpots.com/learn/why-cats-purr