Is Celestia proof of stake?

Could you please clarify whether Celestia actually utilizes a proof-of-stake consensus mechanism? I'm interested in understanding its underlying technology and how it differs, if at all, from other blockchain protocols that employ proof-of-stake. Could you also elaborate on the advantages and potential drawbacks of such a consensus mechanism in the context of Celestia's architecture and operation? Your insights would greatly assist me in gaining a deeper understanding of this cryptocurrency and its place in the wider cryptocurrency and finance landscape.