What is an NFT?
NFT stands for non-fungible token. NFTs are tokens that we can use to represent ownership of unique items. They let us tokenize things like art, collectibles, even real estate. They can only have one official owner at a time and they're secured by the blockchain they are on (Solana, Ethereum, Etc…) – no one can modify the record of ownership or copy/paste a new NFT into existence.
Non-fungible is an economic term that you could use to describe things like your furniture, a song file, or your computer. These things are not interchangeable for other items because they have unique properties.