Dear Rathi Bala,
First of all, centripetal and centrifugal work in opposite directions; centrifugal throws stuff outward from a circle, like mud thrown off a moving car tire. Centripetal pulls things inward toward the center, like planets held in orbit around the sun, for example.
Then, centrifugal is not a real force, it happens simply because of inertia...the tendency for objects to keep moving in a straight line. Centripetal is thought of as a 'real' force, as the gravity which holds the planet. (Current thinking, of course, suggests even gravity is due to the curvature of space, however...)
...or, centripetal as the force of the rope holding the tether ball to its pole.
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There are websites you can find with a search engine as Google to explain thoroughly this brief intro to your interesting question.
