.onion is a special-use top level domain suffix designating an anonymous hidden service reachable via the Tor network
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Wikipedia.
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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