Host stars are stars that are the central component of a planetary system, around which one or more planets orbit. Research in this area focuses on studying the properties of host stars in order to better understand the characteristics and environments of the planets that revolve around them. This includes analyzing the size, temperature, and age of host stars, as well as their chemical composition and variability. Host star research also plays a crucial role in the search for exoplanets and the determination of their habitability potential. By studying host stars, scientists can gain insights into the formation and evolution of planetary systems, as well as the likelihood of finding Earth-like planets in the universe.