Serial comma - Wikipedia
https://en.wikipedia.org/wiki/Serial_comma
OverviewHistoryArguments for and againstAmbiguityRecommendations by style guidesIndividual disputesSee alsoIn English-language punctuation, a serial comma (also called a series comma, Oxford comma, or Harvard comma) is a comma placed immediately after the penultimate term (i.e., before the coordinating conjunction, such as and or or) in a series of three or more terms. For example, a list of three countries might be punctuated as either "France, Italy and Spain" (without the serial comma) or "France, Italy, and Spain" (with the serial comma). In certain situations, the use of th…
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