The darknet refers to portions of the internet that are intentionally hidden and accessible only through specialized software, configurations, or authorization. Unlike the surface web, which search engines index and users access via standard browsers, darknet services run on overlay networks that anonymize users and hosts by routing traffic through multiple intermediary nodes. Tor (The Onion Router) is the best-known example: it provides privacy by encrypting traffic and passing it through a volunteer-run network of relays, enabling websites with .onion addresses to operate outside conventional DNS and hosting. Other privacy-focused networks, such as I2P and Freenet, use different architectures but share similar goals of anonymity, censorship resistance, and decentralized hosting.
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