The “Oxford comma” is the one placed before an “and” in a list of three or more. It’s the subject of an embittered battle among grammar-lovers. You can make up your own mind. Sometimes it’s correct to use it; sometimes it’s more fun not to.Lisa Wade, PhD is an Associate Professor at Tulane University. She is the author of American Hookup, a book about college sexual culture; a textbook about gender; and a forthcoming introductory text: Terrible Magnificent Sociology. You can follow her on Twitter and Instagram.