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A soft drink (see § Terminology for other names) is a drink that usually contains carbonated water (although some vitamin waters and lemonades are not carbonated), a sweetener, and a natural or artificial flavoring. The sweetener may be a sugar, high-fructose corn syrup, fruit juice, a sugar substitute (in the case of diet drinks), or some combination of these. Soft drinks may also contain caffein... en.wikipedia.org