Sky survey is a research area in astronomy that involves systematic observation and mapping of the night sky to gather information about celestial objects such as stars, galaxies, and other cosmic phenomena. Sky surveys use advanced telescopes and imaging technologies to capture high-resolution images of the sky and detect a wide range of astronomical objects. These surveys help astronomers to study the distribution, properties, and evolution of celestial bodies in the universe, and contribute to our understanding of the cosmos. Sky surveys play a crucial role in the field of astrophysics by providing data for various research studies and discoveries in astronomy.