Sky surveys are systematic observations of the night sky, aimed at mapping celestial objects and phenomena. These surveys use telescopes to capture images and data about stars, galaxies, and other astronomical features. By covering large areas of the sky, they help astronomers identify new objects and study their properties, contributing to our understanding of the universe. There are various types of sky surveys, including optical surveys like the Sloan Digital Sky Survey and infrared surveys such as the Wide-field Infrared Survey Explorer. These projects often involve collaboration among scientists and institutions, leading to significant discoveries and advancements in fields like cosmology and stellar evolution.