Stars - the third book in the series "Astronomy and Astrophysics" contains an overview of modern ideas about stars. It tells about the names of constellations and the names of stars, about the possibility of their observation at night and during the day, about the main characteristics of stars and their classification. The focus is on the nature of stars: their internal structure, energy sources, origin and evolution. The late stages of stellar evolution are discussed, leading to the formation of planetary nebulae, white dwarfs, neutron stars, as well as outbreaks of new and supernovae.