Low-mass companions are objects that orbit larger, more massive celestial bodies, such as stars. These companions are typically smaller in size and mass compared to their primary objects, and they can include brown dwarfs, planets, or even smaller objects like asteroids or comets. Studying low-mass companions can provide valuable insights into the formation and evolution of planetary systems, as well as the dynamics of star-planet interactions. Researchers use a variety of techniques, including direct imaging, radial velocity measurements, and transit observations, to detect and characterize these companions. Understanding the properties and interactions of low-mass companions can help astronomers better understand the diversity of planetary systems in our galaxy.