What network is Helium HNT?

Could you elaborate on the Helium Network and its native token, HNT? Specifically, I'm interested in understanding what type of network Helium is, how it functions, and what role the HNT token plays within its ecosystem. Is it a blockchain-based network? If so, what consensus mechanism does it utilize? Additionally, how is the Helium Network positioned to contribute to the emerging Internet of Things (IoT) industry? Understanding these aspects would help me grasp the significance and potential of the Helium Network and its HNT token.