Galaxy classification is the field of astronomy that involves categorizing galaxies based on their observable characteristics, such as their shape, size, and overall structure. The most commonly used system of classification is the Hubble sequence, which divides galaxies into three main types: elliptical, spiral, and irregular. This classification system helps astronomers better understand the diversity of galaxies in the universe and their evolutionary history. Researchers studying galaxy classification often use telescopes and advanced imaging techniques to study the properties of galaxies and classify them according to their characteristics. This research area is important for studying the formation and evolution of galaxies, as well as understanding the broader structure of the universe.