Scientists see purring as a multi-purpose tool cats use to communicate with others and to self-soothe. Research shows that purring starts in kittens as a way to connect with their mother. Later in life, cats use purring in many situations—when happy, when in pain, or when they want something. The sound involves vibrating muscles in the throat, which create rhythmic bursts of sound during breathing. The healing properties of purring vibrations are also an interesting area of study, as they might assist in recovery and pain relief.