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Computer scanners are devices used to create digital copies of physical documents, images, or objects. They work by capturing the content of the item being scanned and converting it into a digital format that can be stored, edited, or shared electronically. Scanners are commonly used in offices, homes, and businesses for tasks such as scanning documents, photos, receipts, and more. They come in a variety of types, including flatbed scanners, sheet-fed scanners, and handheld scanners, each offering different features and capabilities.