CMYK refers to Cyan, Magenta, Yellow, and Black. These are the primary colors that are used in the printing press. The CMYK is a subtractive color system; it absorbs the colored light, which means the higher the value, the more you get close to black.
In the CMYK color code, the C, M, Y, K are Cyan, Magenta, Yellow, and Black values, ranging from 0 to 100 percent. You can produce over 16,000 different color combinations.
The letter K is used to define the black and avoid confusion with blue in the RGB color system; in CMYK, the black is represented with K.
If you add, Cyan, Magenta, Yellow in equal proportion, you will still not get the pure black color because of the colors' impurities. Therefore, black is the key color that brings detail to the image, and it properly aligns the other three colors.
However, that color model is accepted worldwide. But that color system is used at a small scale, where the color accuracy is not a big issue. Mostly in the inject printers that are used in your houses and the offices.

HSV stands for Hue, Saturation, and Value, and that color model is the alternative representation of the RGB color model.
The RGB color model is quite challenging to get accurate red, green, and blue values to get the desired color. Therefore, the artists have developed a new way to define the colors. That is the HSV color model.
In the HSV model, H represents the Hue, which is the color portion that each color, from the six colors occupied in a color hexagon, and is defined from 0 to 360 degrees. The S stands for saturation, which is the ratio of the purity of the Hue. And it ranges from 0 to 100 percent. And V stands for value, which represents the brightness of the color. And it ranges from 0 to 100 percent (from black to white).
The HSV model's six significant colors are Red, Yellow, Green, Cyan, Blue, and Magenta consecutively, where each color occupies an angle of 60 degrees.

• Red falls from 0 and 60 degrees range in the color hexagon.
• Yellow falls from 60 and 120 degrees range in the color hexagon.
• Green falls from 120 and 180 degrees range in the color hexagon.
• Cyan falls from 180 and 240 degrees range in the color hexagon.
• Blue falls from 240 and 300 degrees range in the color hexagon.
• Magenta falls from 300 and 360 degrees range in the color hexagon.

Before using the tool, it is better to know the difference between the two-color models.
CMYK color model is used in the printing process. Ideal for full-color brochures, flyers, posters, and postcards, etc. The printers that we use in our house and office use that color model. Comparing to CMYK, HSV is the alternative representation of the RGB color model. The HSV model is more convenient to the human rather than the RGB model. Many graphic designers and photo editing software have an HSV color model because people find it much easier to read the HSV color value than RGB color values. HSV is also referred to as HSB (Hue, Saturation, and Brightness).