Barcode scanners are input devices, just like a keyboard. When you scan a barcode, the device converts the barcode into a string of characters (numbers or letters) and passes these through to your computer.
For USB barcode scanners, simply plug the barcode scanner into your computer's USB port. The computer should recognise the device and you should be able to start scanning products right away.
For Bluetooth scanners, you will need to “pair” the scanner with your Bluetooth compatible device. Please follow the instructions provided with your chosen device to setup your Bluetooth scanner. Once paired, you should be able to start scanning products right away.