ERC20 token development is to make an improvement within the blockchain network. ERC20 is one of the signs tokens and it can be interchange with other ERC 20 tokens. Most of the ICO's are based on the ERC20 standard of Ethereum and it is an official protocol for proposing improvements to the ETH network. ERC20 Token is a blockchain-based asset with similar functionality to Bitcoin and Ethereum it can hold value and be sent and received.