Cosmic voids are vast, underdense regions of space that occupy the largest volumes of the universe, representing areas with significantly fewer galaxies and gravitational structures than the average cosmic density. These enormous structures are predicted by models of large-scale structure formation, where matter clumps around massive filaments and walls, leaving the voids as the relatively empty pockets between these dense cosmic threads. Within a void, the distribution of galaxies is markedly sparse, and the density contrast relative to the cosmic mean is substantial. Understanding the formation and properties of voids provides crucial insight into the underlying dynamics of the universe, helping constrain models of dark matter distribution and the expansion history of the cosmos.