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Newbie question, how do buttons and LEDs work?

I am new to building my own boards. I downloaded the documentation for the 16 button kit (currently not available to purchase). I am curious how the LED buttons work? Does the rubber button touch the LED and trigger the board to send a signal? I downloaded the Arduino start kit, and they require separate buttons and LEDs to be attached and wired and the button triggers the LED. However, for the Livid builder kit, the rubber buttons are not actually attached to the board. Thanks for answering my silly question! :)

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