A CPLD (Complex Programmable Logic Device) is an integrated circuit that can be programmed to perform specific logic functions. It consists of a collection of programmable logic blocks and interconnects, allowing designers to create custom digital circuits. CPLDs are often used in applications where flexibility and quick prototyping are essential. CPLDs are known for their low power consumption and relatively simple design process compared to other programmable devices like FPGAs (Field-Programmable Gate Arrays). They are commonly used in embedded systems, telecommunications, and consumer electronics, providing a cost-effective solution for implementing digital logic.