What is the difference between physical security and personnel security?

Physical security involves safeguarding a facility and its assets from unauthorized access, theft, or damage through measures like locks, surveillance systems, and security personnel. In contrast, personnel security focuses on ensuring that individuals with access to sensitive areas or information are trustworthy and reliable, often involving background checks and security clearances. While physical security protects the environment, personnel security protects against insider threats and ensures that the right people have access to critical resources. Both are essential for a comprehensive security strategy.