The deep web is the part of the internet that standard search engines do not index, usually because the content sits behind a login, a paywall or a form, or because the owner blocked crawlers. It is far larger than the publicly indexed web.
Why it matters
Most people use the deep web every day without noticing. Your email inbox, online banking, cloud documents, company intranet and medical portals are all deep web pages. They are not secret in a sinister sense; they are simply private. The deep web is also a reminder that "not found on a search engine" does not mean "does not exist", and that the pages worth protecting need strong access controls rather than obscurity.
Example
A page at example.com/account/orders shows a customer's order history after login. A search engine crawler cannot sign in, so it never indexes the page. A public blog post at example.com/blog/hello, on the other hand, is surface web content that crawlers can find.
Common misconceptions
- Deep web means dark web. The dark web is a small, intentionally hidden subset that needs special software.
- Deep web content is illegal. Nearly all of it is ordinary private data.
- Hiding a page from search keeps it secure. Use authentication instead.
Related
Get notified when this term updates
Plus occasional practical tips on uptime and monitoring, nothing else. Unsubscribe anytime.
This page is general information written by our editorial team and updated when documentation changes. Servers and providers differ, so test changes safely first. See our editorial policy and disclaimer.