The Oxford comma
12.03.2019: is also sometimes called a serial comma or a series comma. Its main purpose is clarification. Generally it’s up to you whether or not you use it, but, not using it can cause some strange statements. For example:
I love my parents, Katy Perry and Mickey Mouse (without Oxford comma).
This sentence states that you love your parents, and your parents are Ed Sheeran and Bart Simpson.
I love my parents, Katy Perry, and Mickey Mouse (with Oxford comma).