Oceanography is the study of the physical, chemical, biological, and geological aspects of the ocean. It encompasses a wide range of topics including the circulation of ocean currents, the composition of seawater, marine ecosystems, marine life, and the interactions between the ocean, atmosphere, and land. Oceanographers use a variety of techniques such as remote sensing, numerical modeling, and in situ observations to study the complex and dynamic nature of the ocean. This field is important for understanding climate change, marine biodiversity, coastal processes, and the overall health of the planet.