What is the Deep Web?

The Deep Web is content that resides in searchable databases, the results
from which can only be discovered by a direct query. Without the directed
query, the database does not publish the result. When queried, deep Web sites
post their results as dynamic Web pages in real-time. Though these dynamic
pages have a unique URL address that allows them to be retrieved again later,
they are not persistent.

【 在 Jit (欢欢@Just in time) 的大作中提到: 】
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