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Computers scanners are devices used to convert physical documents and images into digital formats. They work by shining a light on the document or image and capturing the reflected light with sensors. The information is then processed and stored on a computer for viewing, editing, or sharing purposes. Scanners come in various types such as flatbed, sheet-fed, and handheld scanners, each offering different features and capabilities. They are commonly used in offices, homes, and businesses for tasks like scanning documents, photos, receipts, and other paper-based materials.