The following is a quick recap what Cosmos is from the official website at https://cosmos.network:
More than anything, Cosmos is not a product but an ecosystem built on a set of modular, adaptable and interchangeable tools. Developers are encouraged to join the effort to improve existing tools and create new ones in order to make the promise of blockchain technology a reality. These tools are the foundation needed to create the decentralized internet and global financial system of tomorrow.
To go further, read the Cosmos whitepaper.
Since the Cosmos Hub mainnet has officially launched on March 13th 2019, the ATOM cryptocurrency can be bought and sold on various exchange platforms already. Find out where on the list below.
More about Blastoff — The Cosmos Hub Mainnet is Live
This list is updated frequently. Check back soon. Listing does not equal endorsement.
Korea: Coinone, GDAC
Internet of Blockchains