What network does Harmony One use?

I'm curious to understand the underlying technology that drives Harmony One. Could you please elaborate on the network that Harmony One utilizes? Specifically, I'm interested in knowing if it's a blockchain network and if so, what kind of consensus mechanism does it employ? Additionally, is it a public or private network? And does it offer any unique features or advantages compared to other blockchain networks? A concise yet comprehensive explanation would be greatly appreciated.