what is centripetal and centrifugal forces?

centrifugal force is an outward force associated with rotation.Centrifugal force is one of several so-called pseudo force so named because they do not originate in interactions with other bodies situated in the environment of the particle upon which they act. Instead, centrifugal force originates in the rotation of the frame of reference within which observations are made.

The centripetal force is the external force required to make a body follow a curved path. Hence centripetal force is a kinetic  force requirement, not a particular kind of force like gravity or electromagnetism.