Access control systems are security measures that regulate who can enter or use a specific area or resource. These systems can be physical, like locks and keys, or digital, such as passwords and biometric scanners. They help protect sensitive information and ensure that only authorized individuals have access to certain locations or data. These systems often include components like card readers, keypads, and security cameras to monitor and manage entry. By implementing access control, organizations can enhance their security, reduce the risk of unauthorized access, and maintain a safe environment for employees and assets.