Cats purr to express contentment and relaxation.
Purring may help cats self-soothe when they are injured or stressed.
The vibrations from purring can promote healing and reduce pain.
Mother cats purr to communicate and calm their kittens.
Purring is sometimes directed toward humans to solicit care or attention.
Studies suggest purring may have therapeutic effects on humans.
Observe the context of purring to understand its purpose.