CMYK color is CYAN, MAGENTA, YELLOW & BLACK colors, Each color print from a separate plate in layers to create colors, CMYK is also known as four colors.PMS stands for Pantone Matching system, PMS also known as special colors, PMS colors are assigned specific codes for ink mixing. A palette of fourteen basic colors are used to mix inks according to the formulas.These special colors can be used when you need any specific shade to be printed on the boxes.