Classified information refers to data that is restricted from public access due to its sensitive nature. This type of information is often related to national security, military operations, or intelligence activities. Governments classify information to protect it from unauthorized disclosure, which could potentially harm national interests or public safety. There are different levels of classification, such as Confidential, Secret, and Top Secret, each indicating the degree of sensitivity and the potential impact of unauthorized access. Access to classified information is typically limited to individuals with the necessary security clearance, ensuring that only authorized personnel can view or handle it.