Star clusters refer to a group of stars that form a tight-knit pattern in the sky. These celestial objects are also known by various synonyms such as stellar clusters, galactic clusters, astronomical clusters, star groups, and stellar systems. The names of these clusters depend on their size, location, and composition. Some of the well-known star clusters are open clusters, globular clusters, and superclusters. Open clusters have a loose pattern of stars while globular clusters have a denser, spherical shape with thousands of stars. Superclusters, on the other hand, have millions of galaxies clustered together. These different types of star clusters are fascinating celestial objects that continue to intrigue astronomers and stargazers alike.