"Lighten" or "brighten" refers to the process of making something lighter in color or increasing its brightness. This can apply to various contexts, such as adjusting the brightness of a screen, enhancing the color of a painting, or lightening hair color. The goal is often to create a more vibrant or cheerful appearance. In photography, lightening an image can improve visibility and highlight details that may be lost in shadows. Techniques like adjusting exposure or using filters can help achieve this effect. Similarly, in design, brightening colors can evoke feelings of happiness and energy, making spaces or visuals more inviting.