Legacy surveys are large-scale astronomical surveys that aim to collect comprehensive data on a specific area of the sky or a specific type of astronomical object. These surveys typically use advanced telescopes and instruments to collect data on a wide range of objects, from stars and galaxies to asteroids and exoplanets. Legacy surveys are designed to provide a lasting contribution to our understanding of the universe by creating a valuable dataset that can be used by astronomers for many years to come. By collecting data on a large number of objects over a wide area of the sky, legacy surveys help to advance our knowledge of the cosmos and uncover new insights into the nature of the universe.