Dwarf galaxies are small, low-luminosity galaxies that typically contain a few billion stars, compared to the hundreds of billions of stars in larger galaxies like the Milky Way. These galaxies are important objects of study for astronomers because they provide insights into the formation and evolution of galaxies in the universe. Dwarf galaxies come in a variety of types, including dwarf elliptical galaxies, dwarf irregular galaxies, and dwarf spheroidal galaxies. They are often found in clusters or orbiting larger galaxies as satellites. Researchers study dwarf galaxies to understand their properties, such as their structure, composition, and dynamics. They also investigate how interactions with other galaxies, such as tidal forces or mergers, may influence the evolution of dwarf galaxies. Additionally, dwarf galaxies can serve as a testing ground for different theories of galaxy formation and evolution. Overall, the study of dwarf galaxies provides valuable information about the diversity of galaxies in the universe and their role in the larger cosmic hierarchy.