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The Oxford comma optionally situates itself behind the word "and".
I believe it is important in order to have a complete understanding of someones sentence.
Here are two sentences that I will use as an example to show what the meaning behind it without the Oxford comma, and what the meaning of it is with the Oxford comma.
Today I have decided to walk on the beach with my parents, Jaime and Randy.
- This sentence is saying that your parents names are "Jaime" and "Randy". -
Today I have decided to walk on the beach with my parents, Jaime, and Randy.
- This sentence is telling you that you walked with not only with your parents, but also with two people named Jaime and Randy.-
I hope this helped you understand a little bit more on how to not only use the Oxford comma, but what difference it makes.