Ocean currents are large-scale movements of seawater that flow through the world's oceans. These currents are driven by a combination of factors, including wind patterns, the Earth's rotation (the Coriolis effect), temperature differences, salinity variations, and the shape of coastlines and ocean basins. There are two main types of ocean currents: 1. **Surface Currents**: These currents occur in the upper layer of the ocean and are primarily driven by wind.