.onion is a special-use top level domain suffix designating an anonymous hidden service reachable via the Tor network
Contrary to the regular domain names, the .onion domain names cannot be randomly assigned, as they are generated in a cryptographically secure way.
This is why they usually look as a random 16-symbols long line of letters and digits; e.g. 3g2upl4pq6kufc4m.onion is an .onion domain for DuckDuckGo search engine.
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