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The domestic pig (Sus scrofa domesticus) is usually given the scientific name Sus scrofa, though some authors call it S. domesticus, reserving S. scrofa for the wild boar. The wild boar (Sus scrofa) is the wild ancestor of the domestic pig. It was domesticated beginning about 10,000 years ago, possibly in both China and the Middle East (Clutton-Brock 1999). Domestic pigs were spread across Asia, Europe, the Middle East, northern Africa, and the islands of the Pacific in ancient times. Pigs were brought to southeastern North America from Europe by Hernando de Soto and other early Spanish explorers. Escaped pigs became feral and were freely used by Native Americans as food.

Baby domestic pig
The social and adaptable nature and omnivorous diet of the wild boar allowed early humans to domesticate it much earlier than many other forms of livestock, such as cattle. Pigs were mostly used for food, but people also used their hide for shields, their bones for tools and weapons, and their bristles for brushes.

From Wikipedia.