A Field-Programmable Gate Array (FPGA) is a type of semiconductor device that can be programmed after manufacturing. This flexibility allows engineers to customize the hardware to perform specific tasks, making FPGAs ideal for applications in telecommunications, automotive systems, and digital signal processing. FPGAs consist of an array of programmable logic blocks and interconnections, enabling users to design complex circuits without needing to create a custom chip. This adaptability not only reduces development time but also allows for updates and changes to be made easily, enhancing the longevity and functionality of electronic systems.