A smart lock is an electronic door locking system that replaces or works alongside a traditional key lock, allowing secure, keyless access. It can be unlocked using a PIN code, fingerprint, RFID card, mobile app, or Bluetooth/Wi-Fi connection. Smart locks offer enhanced security with features like auto-lock, access logs, temporary user codes, and remote control via smartphone. Ideal for homes, offices, hotels, and short-stay apartments, they combine convenience, modern design, and improved access control.