Gyres are large systems of rotating ocean currents that are driven by wind patterns and the Earth's rotation. They typically form in the major ocean basins and are characterized by a circular motion. There are five major gyres in the world's oceans: the North Atlantic Gyre, South Atlantic Gyre, North Pacific Gyre, South Pacific Gyre, and the Indian Ocean Gyre. These gyres play a crucial role in regulating climate and weather patterns by redistributing heat across the planet. They also influence marine ecosystems, as they can concentrate debris and nutrients, affecting the distribution of marine life. Understanding gyres is essential for studying oceanography and environmental science.