Local Groups are collections of stars, gas, and dust that are bound together by gravity. They are smaller than galaxy clusters and typically contain a few dozen galaxies. The most well-known example of a Local Group is the Milky Way, which is part of a group that includes the Andromeda Galaxy and several smaller galaxies. These groups can vary in size and composition, often containing a mix of spiral, elliptical, and irregular galaxies. Local Groups play a crucial role in understanding the formation and evolution of galaxies, as they provide a more manageable scale for astronomers to study cosmic structures and interactions.