Carbonated water that is plain or flavored, often used as a drink or mixer.
Seltzer comes from Selters, a town in Germany famous for its natural mineral springs. The water from this region became popular in the 1700s, and the name became the generic term for carbonated water.
Selters, Germany still exists and still produces mineral water—it's one of the few product names where the original source is as real and as active today as when Europeans first discovered it!
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