A Galactic Halo is a vast, spherical region surrounding a galaxy, filled with hot gas, dark matter, and old stars. This area extends far beyond the main disk of the galaxy, like a giant bubble. The halo plays a crucial role in the formation and evolution of galaxies, as it contains the materials needed for star formation and helps to hold the galaxy together through gravity. In our own galaxy, the Milky Way, the halo is home to globular clusters, which are tightly packed groups of ancient stars. The presence of dark matter in the halo is essential for understanding the overall mass and structure of the galaxy, influencing how galaxies interact and evolve over time.