How does Helium Mobile work?

Could you elaborate on the workings of Helium Mobile in a concise manner? Specifically, how does it enable decentralized wireless connectivity? Does it rely on a network of users' devices to create a mesh network? If so, how does the incentivization mechanism function to encourage participation? Also, what are the key security measures implemented to safeguard user data and ensure privacy? Understanding these fundamentals will provide insight into the viability and potential impact of this technology.