Neodymium magnets, also known as NdFeB magnets, are a type of rare earth magnet that are made of an alloy of neodymium, iron, and boron. They are the strongest type of permanent magnet available and are used in a wide range of applications, including:

1. Electric motors and generators: Neodymium magnets are commonly used in the rotors of electric motors and generators to produce the magnetic field that drives the motion of the rotor. They are also used in magnetic bearings and couplings.
2. Magnetic separators: Neodymium magnets are used in magnetic separators to separate magnetic materials from non-magnetic materials in industries such as recycling and mining.
3. Magnetic resonance imaging (MRI): Neodymium magnets are used in the construction of MRI machines to produce a strong, uniform magnetic field that is used to image the body’s internal structures.
4. Audio equipment: Neodymium magnets are used in speakers, headphones, and microphones to produce high-quality sound.
5. Wind turbines: Neodymium magnets are used in the generators of wind turbines to produce electricity from the rotation of the turbine blades.
6. Magnetic therapy: Neodymium magnets are used in magnetic therapy to relieve pain and promote healing.
7. Science experiments: Neodymium magnets are used in a variety of scientific experiments and demonstrations, such as levitation and magnetic propulsion.

Overall, the high strength and small size of neodymium magnets make them a popular choice for a wide range of applications where strong and compact magnets are needed.