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Shields are boards that can be plugged on top of the Arduino printed circuit board (PCB) to extend its capabilities. The different shields follow the same philosophy as the original toolkit: they are easy to mount, and cheap to produce. Mouser Electronics lists original Arduino and Arduino Certified products as “Arduino.” Arduino shields are grouped according to which boards they are compatible with. Not all Arduino shields are compatible with all Arduino boards. The Arduino Certified program is designed for companies using processors not currently supported by Arduino who want to certify a basic level of compatibility with the Arduino platform.