ERC-20 is a set of standard requirements and functionality for tokens that are built on the Ethereum network. ERC-20 tokens enjoy all the advantages of the Ethereum network without having to move between blockchains.
The ERC-20 tokens supported by Tap are deposited to Ethereum addresses on Tap. You may also withdraw ERC-20 tokens from Tap to Ethereum addresses. However, make sure that the receiving Ethereum address supports the token you are sending there.