Saturation in design refers to the intensity or purity of a colour. A colour with high saturation is bright and vibrant, while a colour with low saturation appears muted or washed out. Saturation is one of the three key attributes of colour, along with hue and brightness, and is often used to create visual interest and contrast in design. In graphic design, saturation can be adjusted using software tools like Adobe Photoshop or Illustrator to enhance or tone down the intensity of colours in an image or design. High saturation colours are often used to create energy and excitement, while low saturation colours can create a sense of calm or elegance.