The wikipedia article does a pretty good job at explaining them, but in case someone has learned to play the piano without learning any musical theory whatsoever, here is what they are, by example.
A C power chords is just a C and G played simultaneously.
A D power chord is just a D and A played simultaneously.
Like Stephen said, they are neither major nor minor, and are technically not even chords at all because they are not comprised of at least three notes, a prerequisite.
Still, they are commonly called power chords, and though they possess no real "power" beyond that of other musical combinations, contrary to what I once suspected as an innocent pupil of the craft (feeling, almost knowing, that if I knew what they were, I could produce astounding, earth-shattering rock music).
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