(NFTs) derive their name from one of the properties that can make up a crypto asset. Cryptocurrencies, such as Bitcoin, Ethereum, or ERC-20 tokens are fungible, which means that all units in the supply are interchangeable with one another and retain their value if they are divided. In essence, when you hold 1 ETH in your wallet, you generally do not care which one out of the over 117 million ETH currently in existence it is.