EOS came about due to the scalability shortcomings of the Ethereum protocol. The protocol was made by Block.One, headed by Dan Larimer. Larimer had previously created BitShares and Steemit. All in all, EOS's aim is to build a decentralized operating system that supports industrial-scale decentralized applications.
While EOS has no transaction fees, users must stake their EOS tokens to cover the computational costs of their activity. Block producers receive rewards for their work from a 1% annual EOS inflation rate as the token has no cap. EOS.IO is the underlying system that powers the EOS blockchain. EOS.IO achieves its speed and scalability via the delegated Proof-of-Stake consensus mechanism.
You can buy and sell EOS using CoinSmart's highly liquid platform to conduct your trades. You can also use SmartTrade to swap your EOS for some other crypto.