ERC20 is a set of standard requirements and functionality for tokens that arebuilt on the Ethereum network.
ERC20 tokens enjoy all the advantages of the Ethereum network without having to move between blockchains.
The ERC20 tokens supported by Tap are deposited to Ethereum addresses on Tap.
You may also withdraw ERC20 tokens from TAP to Ethereum addresses. However, make sure that the receiving Ethereum address support the token you are sending there.