FPGAs (Field-Programmable Gate Arrays) differ from regular processors like CPUs and GPUs in that they can be reprogrammed to perform specific tasks after manufacturing. Unlike fixed-function processors, FPGAs consist of a matrix of configurable logic blocks and interconnects that can be customized for particular applications. This flexibility allows FPGAs to be used in a wide range of applications such as signal processing, embedded systems, telecommunications, and hardware prototyping.