Cats communicate with humans and other animals through a combination of vocalizations, body language, and scent marking. They often meow, purr, hiss, or growl to express their emotions and needs. Additionally, cats use body gestures such as tail position, ear movement, and facial expressions to convey their feelings. Cats also have scent glands on their paws, face, and body, which they use to mark their territory and communicate with other animals through scent cues.