Complex Programmable Logic Devices (CPLDs) are integrated circuits that can be programmed to perform specific logic functions. They consist of a matrix of programmable logic blocks and interconnects, allowing designers to create custom digital circuits. CPLDs are often used in applications requiring moderate complexity and quick prototyping. CPLDs differ from Field-Programmable Gate Arrays (FPGAs) in terms of architecture and capacity. While FPGAs are suited for more complex designs, CPLDs are ideal for simpler tasks, such as glue logic or state machines. Their non-volatile memory ensures that the programmed logic remains intact even when powered off.