A meme (rhymes with dream) is a unit of information (a catchphrase, a concept, a tune, a notion of fashion, philosophy or politics) that leaps from brain to brain. Memes compete with one another for replication, and are passed down through a population much the same way genes pass through a species. Potent memes can change minds, alter behavior, catalyze collective mindshifts and transform cultures. Which is why meme warfare has become the geopolitical battle of our information age. Whoever has the memes has the power.