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A meme (/ˈmi:m/ meem)[1] is "an idea, behavior, or style that spreads from person to person within a culture".[2] A meme acts as a unit for carrying cultural ideas, symbols, or practices that can be transmitted from one mind to another through writing, speech, gestures, rituals, or other imitable phenomena with a mimicked theme. Supporters of the concept regard memes as cultural analogues to genes in that they self-replicate, mutate, and respond to selective pressures.[3]

The word meme is a shortening (modeled on gene) of mimeme (from Ancient Greek μίμημα pronounced [mí:mɛ:ma] mīmēma, "imitated thing", from μιμεῖσθαι mimeisthai, "to imitate", from μῖμος mimos, "mime")[4] coined by British evolutionary biologist Richard Dawkins in The Selfish Gene (1976)[1][5] 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, fashion, and the technology of building arches.[6]

Proponents theorize that memes are a viral phenomenon that may evolve by natural selection in a manner analogous to that of biological evolution. Memes do this through the processes of variation, mutation, competition, and inheritance, each of which influences a meme's reproductive success. Memes spread through the behavior 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. Memes that replicate most effectively enjoy more success, and some may replicate effectively even when they prove to be detrimental to the welfare of their hosts.[7]

A field of study called memetics[8] arose in the 1990s to explore the concepts and transmission of memes in terms of an evolutionary model. Criticism from a variety of fronts has challenged the notion that academic study can examine memes empirically. However, developments in neuroimaging may make empirical study possible.[9] Some commentators in the social sciences question the idea that one can meaningfully categorize culture in terms of discrete units, and are especially critical of the biological nature of the theory's underpinnings.[10] Others have argued that this use of the term is the result of a misunderstanding of the original proposal.[11]

Dawkins's own position is somewhat ambiguous: he obviously welcomed N. K. Humphrey's suggestion that "memes should be considered as living structures, not just metaphorically"[12] and wanted to regard memes as "physically residing in the brain".[13] Later, he argued that his original intentions, presumably before his approval of Humphrey's opinion, had been simpler.[14] At the New Directors' Showcase 2013 in Cannes, Dawkins' opinion on memetics was deliberately ambiguous.[15]