Cosmos is a network of independent parallel blockchains that are each powered by classical BFT consensus algorithms like Tendermint
The first blockchain in this network will be the Cosmos Hub. The Cosmos Hub connects to many other blockchains (or zones) via a novel inter-blockchain communication protocol.
ATOM is the Cosmos Hub's native token and can be used for Staking economy and community governance. Stake Atom has the opportunity to become a validator for Cosmos Hub and get Staking reward.
Before Cosmos, blockchains were siloed and unable to communicate with each other. They were hard to build and could only handle a small amount of transactions per second. Cosmos solves these problems with a new technical vision。