Centripetal force is a fundamental concept in physics that describes the force acting on an object moving in a circular path, directing it towards the center of the circle or the axis of rotation. It is necessary to keep the object in its circular motion and prevent it from moving in a straight line. This force is always perpendicular to the velocity of the object and is a result of tension, gravity, friction, or any other force that acts on the object and contributes to its centripetal acceleration. In simple terms, centripetal force is the inward force that allows an object to continually change direction and maintain circular motion.