Is It possible to read the code from Arduino board?

Is It possible to read the code from Arduino board, How to do it?

Answer

Before anwsering the question, let's see what happens when you click Upload button on Arduino IDE:

So, in the Arduino board, there is no human-readable code but binary code.

Now let's come back to the main question:

Additional knowledge: Most of MCU has the read-protection option. If this option is enabled, you even cannot read the binary code from the MCU

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