A cylinder lock is a type of locking mechanism commonly used in doors and cabinets. It consists of a cylindrical body that houses a series of pins. When the correct key is inserted, the pins align, allowing the cylinder to turn and unlock the door. These locks are popular for their ease of use and installation. They come in various designs, including single and double cylinder options, which can enhance security. Cylinder locks are often found in residential and commercial settings, providing a reliable way to secure entrances and valuables.