In order to offer you the best Arduino deals some of our boards use a CH340G chipset (if explicitly stated) instead of the Atmel AVR ATmega16U2. This controller is used to convert signals from USB to the serial port of the microcontroller. It is only used for the communication between Arduino and your computer and does not influence the performance of your Arduino board.
We recommend you to install the suitable chipset driver for your operating system if your Arduino is not detected, automatically. You can download it directly from here:

CH340G Drivers:

Operating Systems Download
Windows 98/ME
Windows 2000/XP/VISTA
Windows 7/8/8.1, 32- und 64-Bit
Windows 10/11
Linux no driver needed