Stellar clusters are groups of stars that are gravitationally bound and typically formed together from the same molecular cloud. They come in two main types: open clusters and globular clusters. Open clusters are younger and contain hundreds to thousands of stars, while globular clusters are older and contain tens of thousands to even millions of stars. Stellar clusters are important for studying star formation and evolution, as well as the dynamics of galaxies. They provide valuable insights into the age and composition of stars, and can help astronomers better understand the processes that drive galaxy formation and evolution. Additionally, stellar clusters are used as standard candles for measuring distances in the universe.