Centripetal and centrifugal forces are not considered fundamental natural forces like gravity, electromagnetism, or the strong and weak nuclear forces. Instead, they are considered to be "fictitious forces" or "pseudo-forces" that arise due to the perspective of an observer in a rotating reference frame.
Centripetal force is the inward force acting on an object moving in a circular path, directed toward the center of the circle. It is responsible for keeping the object in its circular motion. In reality, this force is a result of other forces such as tension, gravity, friction, or electromagnetic forces acting on the object.
Centrifugal force, on the other hand, is the apparent outward force experienced by an object in a rotating frame of reference. It appears to act in the opposite direction to the centripetal force but is not a true force itself. It is a product of the inertia of the object trying to move in a straight line, rather than following the curved path.
So, while centripetal and centrifugal forces are often discussed in the context of circular motion, they are not considered fundamental forces but rather concepts used to describe the effects of motion in rotating systems.