Classified documents are official papers that contain sensitive information, which is restricted from public access for national security or privacy reasons. These documents are often categorized into different levels, such as confidential, secret, and top secret, depending on the potential impact of their disclosure. Governments and organizations use classified documents to protect information related to military operations, intelligence, and diplomatic relations. Access to these documents is typically limited to authorized personnel who have undergone background checks and received special clearance to ensure the information remains secure.