What is the Paleo or "Caveman" Diet?

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What is the Paleo or "Caveman" Diet?
Paleo diet is extremely popular nowadays. Whilst definitely there are critics, a lot of people who begin adopting the diet plan find themselves raving fans. But why? Could this be only a gimmick or possibly is there something inherently appropriate about the idea, as in, is it the way we actually are supposed to feed ourselves? A well-known television show appeared to be intrigued sufficiently with the diet movement that they featured it in an episode, which offers a good summary of what the diet is about and the way of life which comes with it.