OB stars are massive stars that belong to the spectral classes O and B. They are some of the hottest, most luminous stars in the universe and are characterized by their blue-white color. These stars are very young and have short lifespans compared to smaller, less massive stars. OB stars play a crucial role in the evolution of galaxies and the universe as a whole. They are responsible for producing heavy elements through nuclear fusion in their cores and can end their lives in spectacular supernova explosions, which can enrich the surrounding interstellar medium with these elements. Research on OB stars involves studying their formation, evolution, and interactions with their environment, as well as their influence on star formation and galaxy evolution. This research helps us understand the processes that shape the universe and the role massive stars play in it.