Etiquette is a code of behavior that delineates expectations for social behavior according to contemporary conventional norms within a society, social class, or group.
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The French word étiquette, literally signifying a tag or label, was used in a modern sense in English around 1750. From the 1500s through the early 1900s, children learned etiquette at school. Etiquette has changed and evolved over the years.

The LADIES' and Gentlemen's Books of Etiquette and Manual of Politeness