Clearance security refers to the processes and controls governing access to classified or sensitive information based on authorised clearance levels. It involves background screening, identity verification, and ongoing monitoring to ensure only approved individuals access restricted data. Clearance security is critical in government, defence, and regulated sectors where data confidentiality is paramount. Effective clearance security integrates with access management systems and compliance frameworks to maintain auditability and accountability. By implementing robust clearance security protocols, organisations reduce insider threat risks and maintain regulatory trust.