Cosmological models are theoretical frameworks used to study the structure and evolution of the universe on large scales. These models aim to explain the origin and evolution of the universe, including the distribution of matter, the formation of galaxies and galaxy clusters, and the expansion of the universe. They are based on Einstein's theory of general relativity and incorporate various physical principles and observations to provide a comprehensive description of the universe as a whole. Cosmological models help scientists understand the fundamental properties of the universe and its history, and they are continuously refined and updated as new data and observations become available.