What are ERC-20 tokens?
Ethereum is a popular Blockchain network designed to allow any developer to encrypt any decentralized application and run it on the Blockchain. The system is based on the use of tokens, also known as cryptocurrencies, which can be sold, bought and transferred. All of this works on Ether, the native token of Ethereum, and this token is used to pay miner fees, transaction fees, and many other network services such as smart contracts.