Can someone explain to me more about DID and what’s the role of a DID resolver?

I’ve heard much about Ethereum DID recently and how the did:ether:0xabcd can be used as an identity without spending any fees to deploy contracts or send any transactions. It’s said that I’m able to use it right away with just my Ethereum public address.

However, I don’t understand how it works as an identity since my public address is already my identity? Why does it need go “be resolved” against a resolver since the public address of my Ethereum account 0xabcd is already clearly in the DID address string?

What’s the point of the Ethereum DID resolver and what does it resolve/query for to use with my public address?