The term "pirate" conjures images of (mostly white, European) sailors flying the skull and crossbones flag and sailing around the Caribbean waylaying treasure ships and such. Regardless of whether this pop culture depiction of pirates in the late 1600s - early-mid 1700s is accurate, that's the image people think of.
But there was international shipping commerce before the Age of Sail. Did cultures such as Carthage or Greece in the Mediterranean, or Ethiopia or Arabia in the Indian Ocean also deal with their own forms of piracy?
An expert on Piracy, Benerson Little, did a fantastic AMA here a while back. I'd encourage you to browse some of the threads for good information on the subject.