A latch is a simple mechanical device used to secure doors, gates, or cabinets. It typically consists of a movable bar or bolt that can be engaged or disengaged to allow or prevent access. Latches can be operated manually, often using a handle or knob, and come in various designs, including sliding, spring-loaded, and hook types. In electronics, a latch refers to a circuit that can hold a binary state (0 or 1) until it is changed by an input signal. This type of latch is essential in digital systems, such as flip-flops and memory storage, where it helps maintain data integrity and control the flow of information.