What is kyber crystals?

Excuse me, could you please elaborate on what kyber crystals are? Are they a type of digital asset or perhaps a unique concept within the cryptocurrency realm? Are they used for any specific purpose, such as in transactions, storage, or as a form of value? Furthermore, is there any historical or cultural significance associated with kyber crystals, or are they purely a product of modern technological advancements? I'm quite intrigued and would love to learn more about them.