Oxford comma

The Oxford comma, also known as the serial comma, is a punctuation mark placed after the second-to-last item in a list before "and" or "or." For example, in the list "apples, oranges, and bananas," the comma after "oranges" is the Oxford comma. Its use can clarify meaning and prevent ambiguity, especially in complex lists. While some style guides recommend its consistent use, others find it optional. Overall, the Oxford comma is a helpful tool for precise and clear communication in written language.