A scanner is a device that converts physical documents and images into digital format. It works by capturing the details of the document using light and sensors, creating a digital copy that can be stored, edited, or shared on a computer. Scanners are commonly used in offices and homes for tasks like digitizing photos, archiving documents, and sending files via email. There are different types of scanners, including flatbed scanners, sheet-fed scanners, and handheld scanners. Each type serves specific purposes, such as scanning books, multiple pages, or small items. Scanners often come with software that helps users manage and edit the scanned files.