What in the world is Artificial Intelligence(AI)?

What is Artificial Intelligence(AI)?      What if someone comes up to you and ask "What is artificial Intelligence?".I'm sure most of you would shrug and say "I don't know,I'm not a tech geek."Truth is,Artificial Intelligence or better known as AI is used everyday from government surveillance medical diagnosis and complex robotics to everyday electronics like smart phones (e.g Siri,GPS,auto...