Description in my blog.

"How does “AERGO” work?

The modern platform consists of 3 main parts:
• Chain is a proposed new protocol consisting of a global public decentralized network run by node providers;
• Hub is responsible for the security of APPs. This part should be tying to Chain;
• Marketplace – the finishing part of platform that is useful for different purchases (it means software items, applications, computing resources and other ones)."

Continuation: https://steemit.com/ico/@blackgreenplague/what-is-blockchain-aergo