Ultra-diffuse galaxies (UDGs) are a type of galaxy characterized by their extremely low surface brightness, making them difficult to detect and study. These galaxies typically have low luminosities and large physical sizes compared to their luminosity, suggesting that they may have a unique formation history or be dominated by dark matter. UDGs are of interest to astronomers as they provide insights into the processes of galaxy formation and evolution in low-density environments, and may challenge our understanding of how galaxies form and evolve in the universe.