The Copernicus Marine Service, a vital component of the Copernicus Programme of the European Union, offers comprehensive, regular, and free information on the physical, sea ice, and biogeochemical aspects of the global and regional ocean. Designed to align with EU policies and international commitments, it supports ocean governance, addresses societal needs for global ocean knowledge, and fosters the Blue Economy by providing state-of-the-art ocean data. This service, funded by the European Commission and executed by Mercator Ocean International, contributes to diverse initiatives, including pollution control, marine protection, maritime safety, renewable marine energy, and climate monitoring. Accessible to the public, the Copernicus Marine Service enhances awareness of ocean-related issues and supports major policies through free, interactive marine data products.