A sintered NdFeB magnet, also known as a sintered neodymium iron boron magnet, is a type of permanent magnet considered the strongest commercially available magnetic material, composed of neodymium, iron, and boron, created through a sintering process where a powdered mixture is compacted and heated to achieve high magnetic properties; it is widely used in applications requiring powerful magnets due to its high energy product and compact size, but usually requires a protective coating to prevent corrosion.