An astronomical survey is a systematic study of celestial objects and phenomena in the universe. These surveys collect data on stars, galaxies, planets, and other astronomical entities to understand their properties, distribution, and evolution. They often use telescopes and other instruments to gather information across various wavelengths, such as visible light, radio waves, and infrared. Surveys can be broad, covering large areas of the sky, or focused on specific regions. Notable examples include the Hubble Space Telescope survey and the Sloan Digital Sky Survey. The data obtained from these surveys contribute to our knowledge of the cosmos and help answer fundamental questions about the universe.