Cats' whiskers, also known as vibrissae, serve several important purposes for felines. They are deeply embedded within the skin and are highly sensitive to touch, which helps cats navigate their surroundings in the dark, determine the size of openings they can fit through, detect nearby objects without seeing them, and even gauge their own emotions and moods. Whiskers also act as a defense mechanism, warning cats of potential danger or threats by detecting changes in air currents. Overall, a cat's whiskers play a crucial role in their sensory perception and overall well-being.