What is the NKN protocol?

Could you elaborate on the NKN protocol in a concise manner? I'm curious to understand its fundamental principles and how it differs from other blockchain-based solutions. Specifically, I'd like to know about its network architecture, the incentive mechanisms it employs to encourage participation, and how it aims to achieve decentralized internet connectivity. Additionally, I'm interested in its scalability potential and how it plans to tackle challenges like latency and security. Your insights would be greatly appreciated.