Marine currents are large-scale flows of seawater that move through the world's oceans. They are driven by factors such as wind, the Earth's rotation, and differences in water temperature and salinity. These currents play a crucial role in regulating the climate by distributing heat from the equator to the poles. There are two main types of marine currents: surface currents and deep-water currents. Surface currents are primarily influenced by wind and can be observed in the upper layers of the ocean, while deep-water currents are driven by changes in water density. Together, these currents form a global system that affects marine ecosystems and weather patterns.