Postliterate society
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A postliterate society is a society wherein multimedia technology has advanced to the point where literacy, the ability to read written words, is no longer necessary. Many advanced science-fiction societies are postliterate. In the Earth society in Dan Simmons's Ilium (novel), for example, only Savi and Harman can read; Savi is a relic from an earlier age, and Harman is a contemporary of the society that has taught himself how to read.
Postliterate is markedly different from preliterate. A preliterate society has not yet discovered how to read and write; a postliterate society has moved beyond the need for reading and writing. All information is either transmitted via sound or some other, more complex means. Postliteracy is sometimes considered a sign that a society is approaching the technological singularity.