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Description extracted from Wikipedia:

Other uses thumb|right|200px|A conversation amongst participants in a 1972 cross-cultural youth convention. Dialogue (sometimes spelled dialog in American English) is a written or spoken conversational exchange between two or more people, and a literary and theatrical form that depicts such an exchange. As a narrative, philosophical or didactic device, it is chiefly associated in the West with the Socratic dialogue as developed by Plato, but antecedents are also found in other traditions including Indian literature.