A Wolf-Rayet star is a type of massive star that has reached an advanced stage of evolution. These stars are characterized by their strong stellar winds and high temperatures, often exceeding 30,000 degrees Celsius. They are typically more than 20 times the mass of our Sun and are known for their distinctive spectra, which show broad emission lines of elements like helium and carbon. Wolf-Rayet stars are important in the study of stellar evolution and the chemical enrichment of the universe. They are often found in star clusters and can end their lives in spectacular supernova explosions, contributing heavy elements to the interstellar medium.