REEs are the "vitamins" of modern industry—required in small amounts but essential for performance.
Neodymium and praseodymium are used to create the world’s strongest permanent magnets, found in everything from smartphone speakers to hard drives. The Rare Earth Elements: An Introduction
Terbium through lutetium, plus yttrium. These are rarer and often more valuable due to their specific high-tech applications. REEs are the "vitamins" of modern industry—required in