An Arduino Shield is a board that can be plugged directly into an Arduino board to provide additional functionality. Shields are designed to make it easy to connect external devices to the Arduino, such as sensors, motors, and displays. For example, the Adafruit Motor Shield V2 allows you to control up to 4 DC motors with your Arduino, while the Adafruit OLED Shield allows you to connect an OLED display to your Arduino.

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