What’s the Oxford comma —
and why does it matter?

Question

Accepted Answer

The final comma in a list before 'and' or 'or'. It disambiguates: 'I invited the strippers, JFK, and Stalin' vs 'I invited the strippers, JFK and Stalin.' — One is a fun party, the other is an unusual biography. A single comma cost a dairy company $5 million in a 2018 US court ruling.

What’s the Oxford comma — and why does it matter?