Cats communicate with humans and other animals through a combination of vocalizations, body language, and scent marking. They may meow, purr, hiss, or growl to express their feelings and needs. Cats also use their body language, such as tail position, ear movements, and facial expressions, to convey their emotions and intentions. Additionally, cats use scent marking through rubbing, scratching, and spraying to communicate with other animals in their environment.