What is the most expensive NFT?

Could you elaborate on the concept of NFTs and highlight the current record holder for the most expensive NFT sold? The non-fungible token market has been booming recently, and I'm curious to know which particular NFT holds the distinction of being the most valuable. Is it a piece of digital art? A collectible? Or perhaps a unique digital asset? I'm fascinated by the intersection of art, technology, and finance, and I'd love to learn more about this record-breaking transaction and its significance in the NFT world.