Q:
A: A barcode reader is the input device used by something else to perform a function such as retrieve data based upon the unique pattern of the barcode. An simple example would be retrieving the cost of an item scanned in an retail sales store. Another example is to select and load the computer code to operate a machine to make a specific part. Basically, barcodes readers where developed as a fast and reliable method of providing computers with readable data displayed graphically in a compact simple format.