1. Fingerprint: Biometric system that scans unique fingerprint patterns for access. It ensures only authorized users can enter, offering fast, secure entry. No need for keys or passwords, reducing the risk of lost credentials or unauthorized entry. A biometric security method that scans an individual’s unique fingerprint pattern.

2. Password: A secret code entered for access, offering simplicity & convenience. However, it can be vulnerable to hacking, theft, or forgetting. Strong, regularly updated passwords enhance security but may still be prone to breaches if not properly managed.

3. RFID: Uses Radio Frequency Identification technology with a tag or card to unlock the door when near the reader. Efficient & contactless, but requires users to carry an RFID tag or card. It offers convenience but can be compromised if lost or stolen.

4. Mobile App: Unlocks doors via a smartphone app using Bluetooth or Wi-Fi. Convenient & modern, it allows remote control but depends on a phone’s battery & connectivity. Security risks arise if the phone is lost or compromised, requiring careful app management.

5. Camera: Security cameras integrated with locks can monitor access & capture video for verification. Often paired with smart locks, cameras provide additional security and help in identifying intruders. However, they require power and can raise privacy concerns.

6. Key: Traditional metal key used in a lock for physical entry. Simple and reliable, it can be lost, stolen, or copied, posing a security risk. Unlike digital systems, it lacks features like remote access or user-specific permissions. It’s a straightforward and familiar method of access but carries risks like loss, theft, or duplication.