Delve into the heart of the internet's most hidden network. The dark web both fascinates and frightens. In this mini book from the MONDES CONNECTÉS collection published by Five Minutes, you'll discover that this shadowy zone is not just a den of hackers. The book deciphers the structure of the web (surface, deep and dark) and explains how tools like Tor ensure anonymity. Drawing on 2024 2025 data, it shows how journalists, dissidents and whistle blowers use these networks to bypass censorship and protect their sources. But it also reveals the underground economy of black markets : drug trafficking, credential theft, malware kits and cryptocurrencies such as bitcoin or Monero. It reviews police operations (Hydra, Incognito, RapTor) that demonstrate authorities are not powerless, and it warns about new threats related to artificial intelligence and deepfakes. Clear and concise, this book provides essential cybersecurity guidance and insists on preserving freedom of expression while combating cybercrime. An indispensable guide to understanding and protecting yourself.