NFT stands for non-fungible token. It is a unique digital token that is recorded on a blockchain and verifies ownership and authenticity. It cannot be copied or replaced by other tokens. It contains references to digital files, such as art, music, photos or videos, which can be linked to real or imaginary assets. It differs from cryptocurrencies, which are fungible and can be exchanged for one another. Owning an NFT does not mean having rights to the associated file or its use, as this depends on the legal status of the NFT and the file. NFTs can be created, sold and exchanged on digital markets, where they can have high value or none. NFTs are criticized for their environmental impact, as some types of blockchain consume a lot of energy and create a large carbon footprint. NFTs are also criticized for their speculative nature, as their price can fluctuate greatly or fall to zero.