Three Laws of Robotics / Asimov's Laws

First Law
A robot may not injure a human being or, through inaction, allow a human being to come to harm.

Second Law
A robot must obey the orders given it by human beings except where such orders would conflict with the First Law.

Third Law
A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.

Zeroth Law
A robot may not harm humanity, or, by inaction, allow humanity to come to harm. This Law was introduced later.