Cats communicate with humans through body language by using various cues such as tail position, ear positioning, eye contact, vocalization, and body posture. For example, a cat may purr, meow, or rub against you to show affection or seek attention. Their tail position can indicate their mood - a tail held high signifies confidence and happiness, while a tail tucked between their legs may indicate fear or discomfort. Paying attention to these cues can help you understand and communicate better with your feline companion.