Open oceans refer to vast areas of saltwater that are not close to any landmasses. These regions cover about 70% of the Earth's surface and are characterized by deep waters, strong currents, and diverse marine life. The open ocean is divided into different zones, including the epipelagic zone, where sunlight penetrates, and the deeper mesopelagic and bathypelagic zones, which are darker and colder. The open ocean plays a crucial role in regulating the Earth's climate and supporting global biodiversity. It is home to various species, including fish, whales, and plankton, which form the foundation of the marine food web. Additionally, open oceans are vital for human activities such as fishing, shipping, and scientific research.