Stellar clusters are groups of stars that are bound together by gravity. They can be classified into two main types: open clusters and globular clusters. Open clusters are younger and contain a few dozen to a few thousand stars, often found in the Milky Way galaxy. In contrast, globular clusters are older, denser, and can contain hundreds of thousands of stars, typically orbiting the galaxy's core. These clusters provide valuable insights into stellar evolution and the formation of galaxies. By studying their stars, astronomers can learn about the age, composition, and dynamics of the universe. Stellar clusters also serve as important laboratories for understanding the life cycles of stars.