Is ontology proof of stake?

Excuse me, could you clarify for me if ontology is indeed a proof of stake system? I've been reading about blockchain technology and various consensus mechanisms, and I'm trying to understand the specifics of how ontology operates. I'm particularly interested in the role of staking in the network and how it contributes to its overall security and decentralization. Could you elaborate on this point and provide any insights into how ontology's proof of stake system differs from other similar protocols in the cryptocurrency space? Thank you in advance for your clarification.