Science Prospects for CMB-S4: Project Overview and Instrument Design

CMB-S4 is a ground-based cosmic microwave background (CMB) experiment, currently funded in design phase to enable transformative measurements with implications spanning cosmology, astrophysics, and fundamental physics. Key science goals include searching for evidence of primordial gravitational waves, probing the dark Universe and neutrino sector, mapping the matter distribution of the cosmos, and exploring the transient millimeter-wave sky. With dedicated telescopes performing deep and wide surveys from the South Pole and Atacama Desert, the maps produced by CMB-S4 from the primordial Universe to large scale structure will offer a valuable resource to the broader community. This talk will highlight the scientific potential of CMB-S4 alongside the instrumentation that will enable these challenging measurements.