A door lock is a device used to secure a door and prevent unauthorized access. Door locks can come in many different types and designs, ranging from simple mechanical locks to more advanced electronic locks with biometric features. Some common types of door locks include deadbolts, knob locks, lever handle locks, and smart locks.
Deadbolts are a popular type of lock that require a key to unlock from the outside, and can be locked or unlocked from the inside using a thumbturn. Knob locks and lever handle locks are typically found on residential doors and require a key to lock or unlock from both the inside and outside.
Smart locks use electronic mechanisms to control access, and can be operated through a smartphone or other electronic device. Some smart locks can also be integrated with home automation systems to provide additional security features such as remote monitoring and access control.

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