Multilevel Security (MLS) is a security model that allows users to access data at different classification levels while maintaining strict control over information flow. It is commonly used in environments where sensitive information must be protected, such as government and military organizations. MLS ensures that users can only access data appropriate to their security clearance, preventing unauthorized access to classified information. In an MLS system, data is categorized into various levels, such as Top Secret, Secret, Confidential, and Unclassified. Users are assigned specific clearance levels, which dictate what information they can view or manipulate. This layered approach helps safeguard sensitive data while allowing necessary access for authorized personnel.