Add Yahoo as a preferred source to see more of our stories on Google. The Oxford comma is the comma used before the final conjunction in a list of three or more items. When writing a list, of course, ...

Use a comma to separate two independent clauses when they are joined by one of seven coordinating conjunctions (for, and, nor, but, or, yet, so). We were out of ice cream, so I went to the store. (c) ...