A non-fungible token stored on the blockchain represents a unique asset. NFTs can represent images, videos, digital art, or any piece of information. NFTs can be traded and allow transfer of ownership and copyright.
### How are NFTs handled in the Blockchain world?
[EIP-721](https://eips.ethereum.org/EIPS/eip-721) defines an interface for handling NFTs on Ethereum blockchain. The creator of the NFT can deploy a new contract on Ethereum or any Blockchain supporting NFT related interface and also, transfer the ownership through the transaction(s).
### How will Ocean Protocol support the NFT market?
Ocean Protocol defines an [ERC721Factory](https://github.com/oceanprotocol/contracts/blob/v4Hardhat/contracts/ERC721Factory.sol) contract, allowing users to deploy ERC721 contract instances on any supported networks.The deployed contract can be associated with Metadata information that describes the unique asset. The Metadata is also stored on-chain. The [Metadata](https://github.com/oceanprotocol/contracts/blob/v4Hardhat/contracts/metadata/Metadata.sol) contract will contain information about the NFT, and associated access rights defined through roles.
ERC20 interface represents fungible tokens. ERC721 and ERC20 combined together can be used for sub-licensing. These sub-licenses can be traded on any AMM as the underlying contract is ERC20 compliant.
Ocean Protocol's [ERC721Template](https://github.com/oceanprotocol/contracts/blob/v4Hardhat/contracts/templates/ERC721Template.sol) provides functionality to create comibinations of ERC721 and ERC20 contract pairs, each of this pair can represent a different sub-license.
