The contrast ratio is a measure that compares the brightness of the brightest white to the darkest black that a display can produce. It is expressed as a ratio, such as 1000:1, indicating how many times brighter the white is compared to the black. A higher contrast ratio generally means better image quality, as it allows for more detail in both bright and dark areas. In the context of displays, such as monitors and televisions, a good contrast ratio enhances the viewing experience by providing clearer images and more vibrant colors. It is especially important for activities like gaming and watching movies, where visual detail is crucial.