NFT (Non Fungible Token) is one of the varieties of cryptographic token on the blockchain. Each non-interchangeable token is one of a kind, it cannot be forged or replaced. The purpose of its creation is to prove authenticity or ownership rights in a digital environment, whether it is a work of art or real estate.
In other words, NFT is an analogue of a security that secures ownership of a unique digital object for a person.