This is a way to host a server that actually hide the IP of the server from the client, just like Tor hides the IP of the client from the server. Amazing tecnology!
This is why it enables hosting illegal things like the Silk Road: law enforcement is not able find where the server is hosted, and take it down or identify the owner.
www.reddit.com/r/onions/comments/sfquss/hidden_answers_is_back/ gives pbqttnffb5sh6ckgnz4f5by55w25gd6tuw5f5qcctmnyk62eyhgx6rad.onion which is Dead Janary 2024
This is where "fun" stuff is likely to be.
Live January 2024.

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Tor, short for "The Onion Router," is an anonymity network designed to enable private and secure communication over the internet. It routes internet traffic through a global network of volunteer-operated servers, known as Tor relays, in order to obscure a user's location and usage patterns from surveillance and traffic analysis. Here are some key aspects of Tor: 1. **Anonymity**: Tor works by encrypting internet traffic multiple times and routing it through a series of randomized relay nodes.