A magnetic field is a vector field that describes the magnetic influence of electric charges in motion and magnetized materials. It arises from the flow of electric charges, whether in the form of an electric current or spinning electrons in an atom. Magnetic fields can be visualized as lines of force that permeate space and are oriented from north to south. They interact with other magnetic fields and electric charges, causing them to move and exert forces on each other. Magnetic fields are essential in many technological applications, such as electric motors, generators, and magnetic data storage devices, as well as in natural phenomena like the Earth’s magnetic field. Magnetic fields are described mathematically using Maxwell’s equations and are measured using devices like magnetometers.