Access Control Systems (ACS) are defined as the hardware and software responsible for regulating and securing the movement of people into facilities, doors, or even digital databases. Types of Access Control Systems: Physical Access Control Systems: These are specialized in securing buildings, offices, and sensitive rooms through electronic gates. Digital or Logical Access Control Systems: These are specialized in protecting computer networks, accounts, and databases (such as Microsoft Access programs or user permissions). Common Verification and Opening Technologies: Face or fingerprint recognition (Biometric), Smart cards and identification tags (RFID & Smart Cards), PIN codes and smartphone applications or Bluetooth.