A herring is a small, silver fish. Most herring that's caught for food is prepared by being smoked, salted, or pickled.
The majority of herring is caught in the Atlantic, though the fish is found in both the North Atlantic and North Pacific Oceans. Because it's very high in the famously healthy Omega-3 fats, herring is considered a healthful fish for people to eat. Herrings is also used as bait for catching larger fish. Although the source of the word herring is uncertain, many experts see a link to the Old English har, or "gray."