The geomagnetic field is the magnetic field that surrounds the Earth, generated by the movement of molten iron in its outer core. This field extends from the Earth's interior out into space, where it interacts with solar wind, a stream of charged particles emitted by the Sun. The geomagnetic field plays a crucial role in protecting the planet from harmful cosmic radiation. The geomagnetic field is not uniform; it varies in strength and direction across different locations. It is also responsible for phenomena such as auroras, which occur when charged particles collide with the Earth's atmosphere near the poles. Understanding the geomagnetic field is essential for navigation and studying the Earth's environment.