Cats communicate with each other through a variety of vocalizations, body language, and scents. They use meowing, purring, hissing, growling, and chirping sounds to express different emotions and needs. They also use body postures such as tail position, ear movements, and facial expressions to convey messages to other cats. Additionally, cats use pheromones released from scent glands located on their bodies to mark their territory and communicate with other felines.