The document discusses various input devices used to enter data into a computer including a keyboard, barcode reader, scanner, video camera, webcam, CCTV camera, and graphic tablet. It defines an input device as any hardware used to enter text, video, graphic, or audio data into computer memory and notes examples of input include keyboards, mice, and touchscreens. Output devices are also mentioned as hardware components that convey processed information to users in the form of text, video, graphic, or audio output.
