Is Polkadot decentralized?

I've been hearing a lot about Polkadot lately, and I'm curious about its decentralization aspect. Could you elaborate on whether Polkadot is truly decentralized? I understand that it's a blockchain-based project aiming to connect various blockchains, but how does its architecture ensure decentralization? Also, are there any central authorities or entities involved in the governance of Polkadot? It would be great if you could provide some insights into this matter.