ERC-20 is a protocol standard for Ethereum-based tokens. This standard is used to predefine specific conditions and functions that a token should meet for being tradable. ERC-20 tokens are very popular in our days because all of them follow the same standard and this fact increases their liquidity. It is easy to develop such tokens from scratch, to place them on
cryptocurrency exchanges and to make them compatible with many software and hardware wallets. ERC-20 protocol is free and the majority of
ICO projects use it for creating their own tokens. Anybody can build a new digital asset by using ERC-20 standard. The development process will be cheap and fast.