The direction is always perpendicular to the direction of motion, and it changes all the time and points to the center of the circle. Regardless of whether the magnitude of the acceleration a changes, the direction of a changes all the time, so circular motion must be variable acceleration motion. It can be understood as the component of the acceleration of an object in circular motion that points to the center of the circle.

Centripetal acceleration calculation

Centripetal acceleration: a=v² / r

r = radius

v = speed