Ocean circulation refers to the large-scale movement of water in the world's oceans, driven by factors such as wind, temperature, and salinity differences. This movement plays a crucial role in regulating the Earth's climate by distributing heat and nutrients across different regions. The two main types of ocean circulation are surface currents, which are primarily wind-driven, and deep-water currents, which are influenced by density differences. Together, these currents form a complex system that affects weather patterns, marine ecosystems, and global climate systems.