Contrast Ratio refers to a measure of how well two different brightness levels can be distinguished from each other. It is an important factor in determining image quality, particularly for displays such as televisions and computer monitors. The higher the contrast ratio, the greater the difference between the darkest and lightest parts of an image that can be displayed simultaneously. This results in a more detailed and vibrant picture with deeper blacks and brighter whites. Contrast Ratio is typically measured in units of candela per square meter (cd/m2) or nit (nits).