What is an Oxford Comma or Serial Comma? What is an Oxford Comma or Serial Comma? In this article, we will cover the basic concept of using oxford comma / serial comma including the rules that apply to it. We will also make it clear that oxford comma is grammatically correct or not. We will try to explain each concept with examples. The Oxford comma, sometime known as serial comma is one of the most controversial punctuation mark among English grammarian.  The Oxford comma or serial comma is just one of many common punctuation rules no one can agree on. In English language punctuation marks, an oxford comma or a serial comma…