Cats use their whiskers, also known as vibrissae, as a sensory tool to navigate their surroundings. The whiskers are highly sensitive and can detect even subtle changes in the environment, such as the location of nearby objects, the width of an opening, or changes in air currents. When a cat encounters an object, its whiskers can help determine the object's size, shape, and texture, allowing the cat to navigate safely through its environment. Additionally, whiskers can also indicate the cat's mood or emotions, such as when they are relaxed or alert.