It makes lists clearer, provides more structure, and better matches the rhythm of normal speech patterns. But watch for special cases.
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About the reviewer
Alex Mohr (alexophile)
Raised by gypsies, I never quite shook my inborn touch of wanderlust. I gallivant around, writing about things I see, do, and think about, which is pretty much anything. Sometimes people even pay me to … more
Also know as the serial comma, the Oxford comma is used before the conjunction that connects the last item of a list. e.g. "I went to the movies with John, Kelly, and Chloe." The comma after Kelly is the Oxford comma. If the list is separated by semicolons, a corresponding semicolon is always used, but when separated by commas, it is optional.