NFTs are non-fungible tokens that are registered on the blockchain. NFTs can be artworks, music files, videos, game items, and other types of digital items. You can obtain NFTs on such marketplaces as OpenSea, Rarible, SuperRare, and Skyweaver Marketplace.
ERC-721 tokens are used for non-fungible assets, e.g. Cryptokitties, Axies from Axie Infinity, and Ethereum Name Service (ENS).