what is a barcode reader

A barcode reader, also known as a barcode scanner, is an electronic input device that can scan and decode barcodes. It uses optical technology, such as infrared light, to direct a beam of light across the barcode and measure the amount of light that is reflected back. The scanner then converts the light energy into electrical energy, which is then converted into data by the decoder and forwarded to a computer. Barcode readers can be connected to a computer through a serial port, keyboard port, or an interface device called a wedge. There are different types of barcode scanners, including pen-type readers, large field-of-view readers, and omnidirectional barcode scanners. Barcode scanners can be handheld or stationary, and they are used in various settings, including retail stores, warehouses, and office buildings.