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Widely used standard for connecting computers to other devices, such as printers and keyboards.

USB (Universal Serial Bus) can be used for connecting a wide range of devices to a host computer. On Arduino boards, a USB connection is commonly used for providing a power supply, loading programs (sketches) into Flash memory, and for sending/receiving other data via serial.

In some cases, such as the Arduino Micro, the microcontroller can be programmed to mimic a USB input device such as a mouse or keyboard.

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