How does Cosmos chain work?

Could you elaborate on the operational mechanics of the Cosmos chain? Specifically, how does it enable interoperability between different blockchains? I'm interested in understanding the role of the Cosmos Hub, the Inter-Blockchain Communication protocol, and how consensus is achieved across various zones within the Cosmos ecosystem. Additionally, how does the Cosmos network handle scalability and security issues, and what are some of the key challenges it faces in achieving widespread adoption? A high-level overview of its architecture and functionality would be greatly appreciated.