Astrophysical surveys involve the systematic observation and study of celestial objects and phenomena across the electromagnetic spectrum. These surveys aim to map and catalog objects such as stars, galaxies, and other celestial bodies, as well as study their properties and distributions. They can help astronomers understand the nature of the universe, the formation and evolution of galaxies, and the distribution of dark matter and dark energy. Astrophysical surveys may use ground-based telescopes, space telescopes, or a combination of both to gather data over large areas of the sky. These surveys play a crucial role in advancing our understanding of the cosmos and are essential for making new discoveries in the field of astrophysics.