A paper scanner is a device used to convert physical paper documents into digital images that can be stored, shared, and edited electronically. There are different types of paper scanners available, each with their own unique features and functionalities. Here's an overview of the different types of paper scanners:  Desktop scanners: These are the most common type of scanner and are designed to sit on a desk or work surface. Desktop scanners are typically flatbed scanners, which means they have a glass surface that documents are placed on for scanning. They are ideal for scanning documents, photos, and other flat objects. Some desktop scanners also come with automatic document feeders (ADF) that can scan multiple pages at once.  Flatbed scanners: These scanners are similar to desktop scanners but are typically larger and have a higher scanning resolution. They are designed to scan large, flat objects, such as artwork, maps, or books. Some flatbed scanners also have a transparency adapter that allows them to scan film negatives and slides.  Mobile scanners: These scanners are designed to be portable and are typically small enough to fit in a backpack or briefcase. They are ideal for scanning documents while on-the-go, and some models can be powered by a battery. Mobile scanners can be either flatbed or sheetfed scanners.  Sheetfed scanners: These scanners are designed to scan multiple pages of a document quickly and efficiently. They are typically faster than flatbed scanners and can scan both sides of a document simultaneously. Sheetfed scanners can be either desktop or mobile.  Overhead scanners: These scanners are designed to scan large, bulky objects, such as books, magazines, or three-dimensional objects. They typically use a camera-based system that captures images from above, and the images are then stitched together to create a single image. Overhead scanners are often used in libraries and museums.  Upright scanners: These scanners are designed to scan large, vertical documents, such as posters or banners. They typically use a sheetfed system and can scan documents up to several feet long. Upright scanners are often used in graphic design and advertising.

In addition to these types of scanners, there are also specialized scanners designed for specific purposes, such as document management or medical imaging. The type of scanner you choose will depend on your specific needs, such as the size of the documents you need to scan, the level of detail required in the scanned images, and the frequency with which you will be using the scanner.