The Family Clupeidae, commonly known as the herring family, is a group of small, oily fish. The word "herring" is the most commonly used synonym for Clupeidae, but there are other synonyms as well. Sardines, shad, and anchovies are all members of the Clupeidae family. The term "forage fish" is also used to describe these small fish, as they are often an important food source for larger marine animals. Additionally, the term "baitfish" is used to refer to Clupeidae caught for use as fishing bait. Whatever you call them, these small, shiny fish play an important role in ocean ecosystems and human diets around the world.