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In English-language punctuation, a serial comma is a comma placed immediately after the penultimate term in a series of three or more terms. For example, a list of three countries might be punctuated either as “France, Italy and Spain” or “France, Italy, and Spain”. Wikipedia
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The Oxford comma is the comma placed before the conjunction at the end of a list of things. For example, in “the flag was red, white, and blue”, the Oxford comma would be the one appearing before “and”. Proponents of the Oxford comma say it’s necessary for removing ambiguity in sentences.
https://www.telc.net/en/about-telc/news/detail/is-the-oxford-comma-really-necessary.html
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The Oxford (or serial) comma is the final comma in a list of things. 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. AP Style—the style guide that newspaper reporters adhere to—does not require the use of the Oxford comma. The sentence above written in AP style would look like this: Please bring me a pencil, eraser and notebook.
https://www.grammarly.com/blog/what-is-the-oxford-comma-and-why-do-people-care-so-much-about-it/
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weehingthong 