A meme [meem] is a unit of cultural ideas, symbols or practices, which can be transmitted from one mind to another through writing, speech, gestures, rituals or other imitable phenomena. Supporters of the concept regard memes as cultural analogues to genes, in that they self-replicate and respond to selective pressures. The British scientist Richard Dawkins coined the word in ‘The Selfish Gene’ (1976) as a concept for discussion of evolutionary principles in explaining the spread of ideas and cultural phenomena.
Examples of memes given in the book included melodies, catch-phrases, beliefs (notably religious beliefs), clothing fashion, and the technology of building arches. Meme-theorists contend that memes evolve by natural selection (in a manner analogous to that of biological evolution) through the processes of variation, mutation, competition, and inheritance influencing an individual meme’s reproductive success. Memes spread through the behaviors that they generate in their hosts. Memes that propagate less prolifically may become extinct, while others may survive, spread, and (for better or for worse) mutate.
The Daily Omnivore 
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