Field-Programmable Gate Arrays (FPGAs) are integrated circuits that can be configured by the user after manufacturing. This flexibility allows engineers to design custom hardware for specific applications, making FPGAs ideal for tasks like digital signal processing, telecommunications, and embedded systems. FPGAs consist of an array of programmable logic blocks and interconnections, enabling users to create complex circuits without the need for custom silicon fabrication. They are widely used in industries such as automotive, aerospace, and consumer electronics, providing a balance between performance and adaptability.