The serial comma, also known as the Oxford comma, is the one before “and” in a series of three or more: Herman Melville wrote “Moby-Dick,” “Billy Budd,” and “Bartleby, the Scrivener.”
It is also the improbable subject of a passionate debate among scholars, journalists, and copy editors. Can’t we all just get along?______________________________ http://www.newyorker.com/culture/culture-desk/comma-queen-the-strippers-j-f-k-and-stalin-or-the-importance-of-serial-commas