White-Out is a correction fluid used to cover mistakes made while writing or typing. It typically comes in a small bottle with a brush or a pen-like applicator, allowing users to apply a thin layer of the fluid over the error. Once it dries, it creates a white surface that can be written on again. Originally developed in the 1960s, White-Out has become a staple in offices and schools. While it was once the primary method for correcting errors on paper, digital tools and software have largely replaced it in many contexts. However, it remains popular for physical documents and crafts.