Variable stars are celestial objects whose brightness changes over time. This variability can occur due to intrinsic factors, such as changes in the star's size or temperature, or extrinsic factors, like the presence of a companion star that eclipses it. Understanding these changes helps astronomers learn more about stellar evolution and the dynamics of our universe. There are several types of variable stars, including Cepheid Variables, which are crucial for measuring cosmic distances, and RR Lyrae stars, often found in globular clusters. Studying these stars not only enhances our knowledge of stellar life cycles but also aids in the exploration of the cosmos.