Thanks for interest.
Powered proof of Stake,short as PPoS.
It's a virtual Proof of Work,every stake in the system has power to calculate puzzle/difficulty,just like Proof of Work in Bitcoin,but no need special rigs,almost no cost for securing p2p network.
And the power is proportional to the amount of stakes,so this means the more stakes,the more power to mint the transaction fees.
Read more about it with whitepaper of CC.