What is an ERC721 token
From CoinWiki
The ERC721 standard was proposed to create an NFT. The proposal allows for tokens to have varying parameters and can be priced differently. Unlike the ERC20 and ERC223 token standards in which the tokens have the same parameters and prices.
Examples:
- Crypto Kitties Virtual game based on the Ethereum Blockchain that allows you to breed and trade virtual kitties.