Classified information within an organisation is typically arranged into several hierarchical levels of sensitivity—e.g. Confidential (C), Secret (S), and Top Secret (TS).

Types of information that are often classified include military defense plans or strategies; intelligence activities (see also military intelligence); military technologies, including nuclear weapons programs; …

In the United States, information is categorized into three primary classification levels: Confidential, Secret, and Top Secret, each reflecting the potential damage that unauthorized release could cause.

This article serves as a comprehensive guide that outlines the types, examples, and essential facts surrounding classified information, fitting into the larger conversation of security and privacy in the …

Classification means the act or process by which information is determined to be classified information. Classification levels means the following three levels at which information may be classified: (a) Top …

Aug 5, 2025 · What Are the 3 Levels of Classified Information? Unpack the system governments use to protect vital information, tiered by potential damage from unauthorized disclosure.

Dec 5, 2025 · The core distinction from public information is stark: public information is intended for disclosure, whereas classified information is defined by its need for stringent protection.

Jan 10, 2023 · Classified information is material that if released could endanger US national security. Learn the procedures for classifying and declassifying information.

Feb 29, 2024 · Classified information and classified national security information refer to sensitive data that the government has identified as requiring protection against unauthorised disclosure.

See the identified Source document to understand each term-definition pair in its proper context. Send inquiries about terminology to the Source's authors; NIST publications will usually include a contact …