Large-scale structures refer to the vast formations of matter in the universe, including galaxies, galaxy clusters, and superclusters. These structures are formed through the gravitational attraction of dark matter and visible matter, leading to the organization of the universe on a grand scale. The study of large-scale structures helps astronomers understand the distribution of galaxies and the overall shape of the universe. Tools like telescopes and computer simulations are used to map these structures, revealing patterns such as cosmic filaments and voids that influence the evolution of the cosmos.