A non-fungible token (NFT) is a unique content included in the blockchain.
It is like a digital form of paintings or game card collections. Only the owner can claim and proof its ownership.
Thanks to the technology behind NFT everybody can own a digital piece of art as if it were a physical one.
You can also buy and collect NFTs like game cards or even a virtual items used in computer games.
Of course rare and appreciated NFTs gain price quickly, so it can be a form of investment.