What is the difference between ETH and ETH PoW?

Could you elaborate on the key differences between ETH and ETH PoW? As both seem to be related to Ethereum, I'm curious about the fundamental distinctions. Is ETH PoW a fork or a separate chain? What are the technical variations in consensus mechanisms, mining algorithms, or transaction processing? Additionally, how do these differences impact the value proposition, security, scalability, and community support for each? Clarifying these points would help me understand the nuances between the two.