ERC20 is a protocol that allows developers to create tokens on the Ethereum network, whether this is a currency, an asset or a virtual share.
Coinbase announcing to support the ERC20, it will likely boost the value of some of these tokens, although it has not been indicated when or which coins it will be listing for trade.
Eos is a blockchain platform where decentralised applications are being developed by Block One. It provides an operating system for applications which include user authentication, cloud storage and server hosting.