The Sloan Digital Sky Survey (SDSS) is a major astronomical survey that began in 2000. It aims to map the universe by capturing detailed images and spectra of millions of celestial objects, including galaxies, stars, and quasars. The survey uses a dedicated telescope located at Apache Point Observatory in New Mexico, USA. SDSS has produced a vast database that is freely available to researchers and the public. This data has significantly advanced our understanding of the universe, including the distribution of galaxies and the nature of dark matter. The project continues to evolve, with new phases expanding its scope and capabilities.