These are non-fungible tokens created on a blockchain. Non-fungible, since they are indivisible. And cannot be replaced by another such token. This makes them unique. They represent a computer code implanted within. It vests them with a unique identity. They can be purely digital assets or can represent physical assets in a digitised form.

The developers can add meta data or any traits to the NFTs. These can take the form of art, music and video.

These can be traded on a blockchain ledger which shows the current owner of the NFT. They act as digital collectibles.

Most of the NFTs are part of the Ethereum blockchain. In the contract another feather can be incorporated to effect the sales and distribution. Thus it is a smart contract. It auto executes NFTs.