The SPT-SZ survey refers to the South Pole Telescope Sunyaev-Zel'dovich (SPT-SZ) survey, which is a cosmological survey conducted using the South Pole Telescope. This survey aims to study the cosmic microwave background radiation and galaxy clusters through the Sunyaev-Zel'dovich effect, which is a change in the temperature of the microwave background radiation when it passes through hot clusters of galaxies. The SPT-SZ survey has provided valuable insights into the large-scale structure of the universe, as well as the evolution of galaxy clusters and the nature of dark energy and dark matter.