Four-colour process, also known as CMYK printing, is a method of reproducing full-colour images by using four ink colours: cyan, magenta, yellow, and black. This process is commonly used in the printing industry to create vibrant and detailed prints, as it allows for a wide range of colours to be produced by combining different percentages of the four inks. The four-colour process is based on the principle of subtractive colour mixing, where the inks absorb certain wavelengths of light to create the desired colours. This technique is essential in creating high-quality prints for various materials, such as magazines, brochures, and packaging, and has revolutionized the world of printing with its ability to produce stunning and lifelike images.