A "Cosmic Void" refers to vast, empty regions in the universe that contain very few or no galaxies. These areas are often much larger than typical galaxies and can span millions of light-years across. They are significant in the study of cosmic structure and the distribution of matter in the universe. Cosmic voids are thought to be formed by the gravitational effects of surrounding matter, such as galaxies and galaxy clusters. Their existence helps astronomers understand the large-scale structure of the universe and the overall distribution of dark matter and dark energy.