NFTs, or Non-Fungible Tokens, are a type of digital asset created using blockchain technology. The term "non-fungible" essentially means that each token is unique and can't be replaced with something else. This is in contrast to "fungible" assets like traditional money or cryptocurrencies like Bitcoin, where each unit is essentially the same as every other unit.

Each NFT has a digital signature that confirms its authenticity and ownership. This means NFTs can represent ownership of a unique piece of content, such as a digital artwork, a music file, or even a tweet. The blockchain records the details of the NFT, including who owns it and the transaction history, which is transparent and cannot be altered or deleted.

NFTs are usually built on the Ethereum blockchain, but other blockchains like Binance Smart Chain, Flow, and Tezos have also started to support them. 

Artists or content creators can "mint" NFTs, turning their digital content into a token on the blockchain. They can then sell these NFTs, often through an NFT marketplace like OpenSea, Rarible, or NBA Top Shot. The creator can also set up royalties to get a percentage of sales whenever the NFT is resold.

When you buy an NFT, you gain the ownership rights to a unique piece of data on the blockchain. While anyone can view or download the digital content associated with the NFT (like a digital artwork), only the owner of the NFT has the "official" version.

NFTs have been criticized for various reasons. Critics point out that the creation and trading of NFTs are currently energy-intensive and contribute to the environmental impact of blockchain technologies. There are also concerns about market volatility, potential for asset bubbles, and copyright infringement issues.
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