FPGA design refers to the process of creating and implementing digital circuits using Field Programmable Gate Arrays (FPGAs), which are semiconductor devices that can be programmed to perform a variety of functions. This design process involves specifying the desired functionality in a hardware description language, allowing for the creation of custom logic circuits that can be reconfigured as needed. FPGAs are widely used for their flexibility, speed, and ability to handle parallel processing, making them ideal for applications ranging from telecommunications to automotive systems.