Sentinel-3B is the twin satellite of Sentinel-3A, launched as part of the European Union's Copernicus program for Earth observation. It shares similar objectives with Sentinel-3A, aiming to monitor Earth's oceans, land, and atmosphere to support oceanography, climate studies, and environmental monitoring. The primary objectives of Sentinel-3B are similar to Sentinel-3A and remains operational and continues to acquire data for oceanography, land monitoring, and atmospheric studies. Its data is freely available to users worldwide through the Copernicus Open Access Hub, supporting scientific research, environmental monitoring, and decision-making processes.