An NFT, or non-fungible token, is a digital asset -- a unit of data -- stored via blockchain. The term “non-fungible” means unique, which is what makes NFTs valuable and sell for high prices. While cryptocurrencies like Bitcoin or Ethereum represent monetary value, NFTs are most used to represent one-of-a-kind digital works of art, including photos, videos, memes, tweets, and albums. The first NFT was created in 2014, however, it wasn't until 2021 they started to become popular.