Magnet-a piece of iron (or an ore, alloy, or other material) that has its component atoms so ordered that the material exhibits properties of magnetism, such as attracting other iron-containing objects or aligning itself in an external magnetic field.
Magnetic field-a region around a magnetic material or a moving electric charge within which the force of magnetism acts.
They are used to construct the electrical motors and the generators which convert the electrical energy into mechanical energy and vice verse
they are also used to convert the electrical energy into sound energy
They are used in TV screens, computer screens, telephones, and tape recorders