Complex Programmable Logic Devices (CPLDs) are integrated circuits that can be programmed to perform specific logic functions. They consist of multiple programmable logic blocks and interconnections, allowing designers to create custom digital circuits. CPLDs are often used in applications like signal processing, data routing, and control systems. CPLDs differ from other programmable devices, such as FPGAs (Field-Programmable Gate Arrays), in terms of complexity and size. While FPGAs can handle more complex designs, CPLDs are typically easier to use for simpler tasks. Their non-volatile memory ensures that the programmed logic remains intact even when power is removed.