Are ETH and ERC-20 the same?

I'm curious to understand the difference between ETH and ERC-20. Are they essentially the same thing, or do they serve distinct purposes within the cryptocurrency ecosystem? Could you please elaborate on the key distinctions between the two, and perhaps provide some examples to further illustrate your points? I'm eager to gain a clearer understanding of how these concepts relate to each other in the broader context of blockchain technology and finance.