A serial comma (or Oxford comma) is an optional comma used before the last item in a list. For example, “bread, butter, and tax evasion” uses a serial comma, whereas “bread, butter and tax evasion” does not.
Do you use it? Why or not? I myself always use it, and I find it really weird when it’s not there. I don’t perceive any less of a pause between the last two items in a list than between any others, so it feels natural to put a comma there as well. Tbh, I’m so used to it that I usually have to do a double-take when it’s not there (since it looks like a grammar error to me at first).
Eh, in casual situations like this, it depends on if the , registers or not. I’m not wasting attention to go back and add one.
But otherwise, as useful. It helps clarify the difference between ands. Some ands are used to connect two things in the entire list as a unit, so when that is a factor, it helps.