Galaxy population refers to the study and classification of different types of galaxies based on their properties such as size, shape, composition, and distribution in the universe. Researchers in this field study the characteristics of galaxies, their formation and evolution, as well as their interactions with other galaxies and the surrounding environment. By studying galaxy populations, scientists aim to better understand the structure and dynamics of the universe, as well as the processes that govern the evolution of galaxies over time. This research area also plays a crucial role in advancing our knowledge of cosmology and the origins of the universe.