Cats' meows vary in tone, duration, and pitch, and these vocalizations communicate different messages to their owners and other cats. Cats use different tones, durations, and pitches to communicate different emotions, such as fear, aggression, and affection. Additionally, cats use meows to communicate specific requests to their owners, such as when they are hungry or need attention. Finally, cats use meows to communicate with other cats, as different meows can convey different messages, such as warnings or invitations to play.