Where on an Android device can I find information about the make, model, etc of the device?

I don't own a smartphone and I don't use Android but other than that I'm a tech guy (-: My father has a Samsung Android phone but doesn't know what model it is and it has no markings on the case. I want to find out the specs of his phone. I expect there must be some app or settings on every Android device, or possibly a proprietary Samsung one, that tells us all kinds of info about the phone. But neither of us can find it. What should I find and click on any arbitrary Android (or Samsung) device?