Digital locks are the types of physical locks that Juan installed in this scenario. A physical lock is a device that prevents or restricts access to a physical location or environment, such as a door, a cabinet, a drawer, etc. A physical lock can have different types based on its mechanism or technology. A digital lock is a type of physical lock that uses electronic or digital components, such as a keypad, a card reader, a fingerprint scanner, etc., to unlock or lock . A digital lock can be used to provide enhanced security and convenience to users, but it can also be vulnerable to hacking or tampering. In the scenario, Juan installed a physical lock at the entrance of each floor. All employees in the organization were allotted a smart card embedded in their ID cards, which had to be swiped to unlock doors and access any floor. This means that he installed digital locks for those doors. A mechanical lock is a type of physical lock that uses mechanical components, such as a key, a bolt, a latch, etc., to unlock or lock. A combination lock is a type of physical lock that uses a sequence of numbers or symbols, such as a dial, a wheel, or a keypad, to unlock or lock. An electromagnetic lock is a type of physical lock that uses an electromagnet and an armature plate to unlock or lock.