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"Pins" are like gateways between the Arduino code running on the chip and the components attached to Arduino. It can refer either to the physical connectors on the board, or it can refer to the pins defined in the code.

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What do these pins on the Uno do?

I've been wondering for a long time what these pins, labeled ICSP and blank, do. I can't seem to find a diagram that explains them, so I've been wondering: What are they for? …
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