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An Oxford comma, also known as a serial comma, is a punctuation mark that is used to separate items in a list. At the end of a list, the oxford comma is used to clearly divide the items in the list.
The Oxford comma is used differently in different style guides, and it is not strictly enforced in grammar.
While the Oxford comma isn’t required, its lack in a statement can lead to some misunderstanding and, in certain situations, make the text outright hilarious.