What is the difference between circular motion and uniform circular motion?

Circular motion is motion around a circular path. It may have a

constant speed, or it may speed up, slow down, stop for a while,

then start up suddenly, proceed in jumps, then slowly peter out

again until it's barely crawling, then accelerate to such a high speed

that the track starts smoking.

If the circular motion is at a constant speed and doesn't speed up

or slow down, then it's called 'uniform' circular motion.