You can think of EOS as the next generation blockchain with high scalability, speedier transactions, a unique governance model and much more that I too dunno!
You can read more about it at:
https://steemit.com/eos/@eosio/introducing-eos-io-application-stack
or EOSIO's version 1.0 release posted today at:
https://medium.com/eosio/eosio-1-0-release-ca67ad3aa78f