An oceanographer is a scientist who studies the ocean, its physical and biological characteristics, and how it interacts with the Earth's atmosphere. They use various methods such as collecting data through observations, experiments, and computer models to understand the complex processes that occur in the ocean, including waves, currents, temperature, salinity, and marine life. Oceanographers often work on research vessels or at sea stations, analyzing their findings to better understand how human activities impact the oceans and develop strategies for conservation and management of our marine resources.