A scanner is a device that converts physical documents and images into digital format. It works by capturing the details of a page using light and sensors, allowing you to save, edit, or share the content on your computer. Scanners are commonly used in offices and homes to digitize important papers, photos, and artwork. There are different types of scanners, such as flatbed scanners and handheld scanners. A flatbed scanner has a glass surface where you place the document, while a handheld scanner is portable and can be moved over the page. Both types help in preserving documents and making them easily accessible through devices like computers and smartphones.