Final answer:
Classified material is sensitive information that is restricted from public access for various reasons, such as national security or protecting privacy rights.
Step-by-step explanation:
Classified material refers to information that is designated as sensitive and restricted from public access. It can pertain to national security, foreign policy, trade secrets, personnel privacy rights, and law enforcement matters. The government has the authority to classify and declassify information based on various reasons, such as to protect national security, prevent embarrassment, or conceal violations of the law.