Galaxy groups are collections of galaxies that are bound together by gravity. These groups typically contain a few to several dozen galaxies, which can vary in size and type. The Milky Way, for example, is part of a galaxy group known as the Local Group, which includes over 50 galaxies, such as the Andromeda Galaxy. These groups are smaller than galaxy clusters, which can contain hundreds or thousands of galaxies. Galaxy groups play a crucial role in understanding the large-scale structure of the universe and the interactions between galaxies, including mergers and gravitational influences.