Color contrast refers to the difference in luminance or color that makes an object distinguishable from its background. High contrast, such as black text on a white background, enhances readability and visual clarity. Low contrast, like light gray text on a white background, can make it difficult to read and may cause eye strain. In design, effective color contrast is essential for accessibility, ensuring that all users, including those with visual impairments, can perceive content. Tools and guidelines, such as the Web Content Accessibility Guidelines (WCAG), help designers choose color combinations that provide sufficient contrast for better user experience.