What is an "Oxford Comma?"

I just feel like giving out some points so have at it

An Oxford comma is the comma before "and" "or" or "but"

Explanation:

The Oxford (or serial) comma is the final comma in a list of things.

Explanation:

For example: Please bring me a pencil, eraser, and notebook. The Oxford comma comes right after eraser. Use of the Oxford comma is stylistic, meaning that some style guides demand its use while others don't.

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