The internet is commonly divided into three layers:
- Surface Web (4-5% of the internet): Everything indexed by 搜尋 engines like Google, Bing, and DuckDuckGo. Websites you find through a normal 搜尋 - news sites, social media, Wikipedia, online stores. Anyone can access these pages without special tools.
- Deep Web (90-95% of the internet): Content that exists online but is NOT indexed by 搜尋 engines. This includes your email inbox, online banking, private databases, medical records, academic journals behind paywalls, corporate intranets, and password-protected content. You access the deep web every day without realizing it.
- 暗網 (less than 0.1% of the internet): A small subset of the deep web that requires special software to access - primarily the Tor 瀏覽器. 暗網 sites use .onion addresses and are intentionally hidden. This is where 匿名 communication, 抗審查 publishing, and 隱私 tools exist.
The key insight: the deep web is huge and mostly mundane (your email is deep web). The 暗網 is tiny and requires Tor.