EOS is the native token of EOSIO. EOSIO is software that introduces a new blockchain architecture designed to enable vertical and horizontal scaling of decentralized applications.
This is achieved by creating an operating system-like construct upon which applications can be built. The software provides accounts, authentication, databases, asynchronous communication, and the scheduling of applications across multiple CPU cores and/or clusters.
The resulting technology is a blockchain architecture with potential to ultimately scale to millions of transactions per second, eliminates user fees, and allows for quick and easy deployment and maintenance of decentralized applications, in the context of a governed blockchain.
EOSIO is built by Block.one.