A Physical Access Control System (PACS) is an electronic security solution that manages who can enter buildings or specific areas using readers, credentials, software, and integrated policies. PACS combines hardware like card, mobile, or biometric readers with cloud or server-based management platforms that store user profiles, access rules, and audit logs. Modern PACS integrates with video, alarms, and enterprise systems to enhance security and streamline operations. Commercial PACS are more advanced and scalable than residential systems, offering biometric/RFID support, extensive integrations, and cloud automation. When choosing a solution, organizations must consider scalability, credential types, cost, integrations, and long-term maintenance. Platforms like Kisi deliver mobile, RFID, a

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