Tae Kwon-Do uses different coloured belts as a progressive ranking system to indicate the students level of experience. When students begin they wear a white belt and expert students wear a black belt.
There are six different coloured belts in Tae Kwon-Do
Three Junior Coloured Belts:

Three Senior Coloured Belts:

These colours have not been randomly chosen, they are steeped in Korean tradition. The colours black, red and blue represent the various level of royal hierarchy that existed during the Silla Dynasty.