A field-programmable gate array, or FPGA, is a type of hardware that can be programmed to work as a computer or circuit in a device. It is made out of a bunch of "gates" (like tiny switches) that can be connected together to do different tasks. When you program an FPGA, you tell it which gates to connect together and what functions to perform. FPGAs are like blank pieces of paper that you can draw your own circuit on and use for a variety of different tasks.