a device that can be used to insert data into a computer or other computational device

a device that accomplishes its purpose electronically

A barcode reader (or barcode scanner) is an electronic device that can read and output printed barcodes to a computer.

a computer peripheral device enabling printed material, including characters and diagrams, to be scanned and converted into a form that can be stored in a computer.

a device that analyzes a real-world object or environment to collect data on its shape and possibly its appearance (e.g. color).

a scanner that captures image information with photomultiplier tubes (PMT), rather than the charge-coupled device (CCD) arrays found in flatbed scanners and inexpensive film scanners.

a scanner that is moved over the subject to be imaged by hand.