Magnet?

A magnet is an object that produces a magnetic field and attracts certain materials such as iron, nickel, and cobalt.

Magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, cobalt, and some of their alloys. The magnetic field of a magnet can also exert a force on currents of electric charge, such as those in a wire.