Access control is a key component of physical security. It involves limiting access to the premises to authorized personnel only. This can be achieved through the use of key cards, fingerprint scanners, and other biometric authentication methods. Access control helps to ensure that only those who are authorized to be on the premises are allowed entry. This can help to prevent theft, vandalism, and other security breaches. Access control should be used in conjunction with other physical security measures such as security cameras and alarm systems for a comprehensive security plan.