The Oxford comma (sometimes called a serial comma) is used in a series of three or more words separated by commas and a final conjunction. For example, “The countries on my bucket list to visit are Spain, France, and Greece.” Some grammarians feel that the Oxford comma is often redundant and therefore not necessary; that “and” works as a substitute for the last comma; i.e., “The countries on my bucket list to visit are Spain, France and Greece.” In this particular example, either convention works fine. But removing an Oxford comma can cause ambiguity (or worse) in some instances: “Every Sunday morning I read the comics, the Wall Street Journal and the Christian Science Monitor.” Without an Oxford comma, this sentence gives me pause. Are the Wall Street Journal and the Christian Science Monitor that funny?
And so on: