The EMSO ERIC is a distributed research infrastructure, consisting of 14 ocean observation systems and test sites located in the Atlantic Ocean, the Mediterranean, and the Black Sea which constantly measure different biogeochemical and physical parameters. The overarching goal of EMSO is to explore, monitor, and better understand the phenomena happening within and below the oceans and their critical impact on the Earth, providing valuable data and services to a large and diverse group of users for addressing global challenges.