Raspberry Pi is a small and affordable computer that you can use to learn programming.
"The difference between Raspberry Pi and Arduino"
An Arduino is a microcontroller motherboard. A microcontroller is a simple computer that can run one program at a time, over and over again. It is very easy to use.
A Raspberry Pi is a general-purpose computer, usually with a Linux operating system, and the ability to run multiple programs. It is more complicated to use than an Arduino.
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