A jargon-free explanation for artists and creators.
What is an NFT?
It's a unique piece of information that lives on the Internet, and it contains a reference to your digital art. While your art can be copied easily, NFTs can't be copied.
How do you create and sell an NFT?
You can create NFTs on most NFT marketplaces, like Rarible, Opensea or Mintable. Creating an NFT is called "Minting an NFT".
Of course, there's a lot more to NFT than the simplifications above. NPR has a good overview if you want to learn a bit more.