Stellar structures refer to the various components and layers that make up a star. These include the core, where nuclear fusion occurs, the radiative zone, where energy moves outward through radiation, and the convective zone, where energy is transported by convection currents. Each layer plays a crucial role in the star's lifecycle and energy production. Different types of stars, such as red giants, white dwarfs, and neutron stars, exhibit unique stellar structures based on their mass and evolutionary stage. Understanding these structures helps astronomers learn about the formation, evolution, and eventual fate of stars in the universe.