The CMYK model is a color model used in color printing that stands for Cyan, Magenta, Yellow, and Key (black). It works by subtracting varying percentages of these four colors from white light to create a wide range of colors. This model is essential for producing vibrant images in printed materials, as it closely aligns with how inks mix on paper. In the CMYK model, each color is represented as a percentage, indicating how much of each ink is used. For example, a color might be described as 40% Cyan, 30% Magenta, 20% Yellow, and 10% Key. This method allows for precise color reproduction in various printing processes, making it a standard in the graphic design and printing industries.