Without any additional context, this probably refers to Tor onion services: https://en.wikipedia.org/wiki/.onion https://en.wikipedia.org/wiki/.onion You can d

Without any additional context, this probably refers to Tor onion services: https://en.wikipedia.org/wiki/.onion https://en.wikipedia.org/wiki/.onion You can download Tor Browser to access them. You can find legit onion links using sites like dark.fail.