# Concepts

# Class

x/nft module defines a struct Class to describe the common characteristics of a class of nft, under this class, you can create a variety of nft, which is equivalent to an erc721 contract for Ethereum. The design is defined in the ADR 043 (opens new window).

# NFT

The full name of NFT is Non-Fungible Tokens. Because of the irreplaceable nature of NFT, it means that it can be used to represent unique things. The nft implemented by this module is fully compatible with Ethereum ERC721 standard.

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`nft`

State

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The development of the Cosmos SDK is led primarily by Interchain Core Teams. Funding for this development comes primarily from the Interchain Foundation, a Swiss non-profit.