Anti-aliasing is a technique used in digital graphics to reduce the jagged edges that can appear on curved or diagonal lines. When images are displayed on screens, the limited resolution can create a staircase effect, making lines look rough. Anti-aliasing smooths these edges by blending the colors of the pixels at the boundary, creating the illusion of a smoother line. This method is commonly used in video games, computer graphics, and even in fonts to enhance visual quality. By applying anti-aliasing, designers can make images look more polished and realistic, improving the overall experience for users interacting with software or games.