Globular star clusters are tightly packed groups of stars that orbit the centers of galaxies. They typically contain thousands to millions of stars, all bound together by gravity. These clusters are often spherical in shape and can be found in the halo of a galaxy, such as the Milky Way. Globular clusters are among the oldest objects in the universe, with ages ranging from 10 to 13 billion years. They provide valuable insights into the early formation of galaxies and the evolution of stars. Notable examples include M13 in the Hercules constellation and Omega Centauri, the largest known globular cluster.