I found this image yesterday and thought it was cool.

1. Surface Web
   • Bing
   • Google
   • Wikipedia
2. Deep Web
   • Academic Information
   • Medical Records
   • Legal Documents
   • Scientific Reports
   • Subscription Information
   • Social Media
   • Multilingual Databases
   • Financial Records
   • Government Resources
   • Competitor Websites
   • Organization-specific Repositories
3. Dark Web
   • Illegal Information
   • TOR-Encrypted sites
   • Political Protests
   • Drug Trafficking sites
   • Private Communications