（Presented by WAW Creation）
答：A Non-Fungible Token (NFT) is used toidentify something or someone in a uniqueway. This type of Token is perfect to be used on platforms that offer collectible items, access keys, lottery tickets, numbered seats for concerts and sports matches, etc. This special type of Token has amazing possibilities so it deserves a proper Standard, the ERC-721 came to solve that!
答：The ERC-721 introduces a standard for NFT, in other words, this type of Token is unique and can have different value than another Token from the same Smart Contract, maybe due to its age, rarity or even something else like its visual. Wait, visual? Yes! All NFTs have a uint256 variable called tokenId, so for any ERC-721 Contract, the pair contract address, uint256 tokenId must be globally unique. That said, a dApp can have a "converter" that uses the tokenId as input and outputs an image of something cool, like zombies, weapons, skills or amazing kitties!
NFT成為英國《柯林斯英語詞典》（Collins Dictionary）2021「年度十大代表關鍵字」之首，有人質疑是個泡沫。但在經濟學者眼中，這從來是個產權問題。權利界定是市場交易的先決條件，「The delineation of rights is an essential prelude to market transactions」是產權經濟學之父高斯說過的。權利界定對市場發展的影響，是舉足輕重的。我最喜歡的例子，是傳統印第安部族捕獵水牛的一個做法：
On a buffalo hunt, the successful hunter was "entitled to keep the skin and some choice portion of the meat for his family" (Steward 1938, 253)... The hunters marked their arrows distinctively, so after the hunt, the arrows in the dead buffalo indicated which hunters had been successful (Ewers 1969,160). Disputes over whose arrow killed the buffalo were settled by the hunt leader.