A brief introduction to Dark Web. Covers difference between Surface, Deep and Dark Web. Shows application of Dark Web like illegal marketing of drugs, arms, etc. Also covers a case study of Silk Road which shows how it works and it's payment mode. It also covers technologies used to access Dark Web using various browsers like TOR and covers it's internal mechanism how it works keeping anonymity using Onion Routing.It also shows some Illegal marketing statistics which shows how it's affecting real world.