Xilinx ISE is a powerful software tool used for FPGA (Field-Programmable Gate Array) circuit design and implementation. It provides users with a comprehensive set of tools and features for designing, simulating, synthesizing, and testing digital circuits. Xilinx ISE is widely used in various industries such as aerospace, defense, telecommunications, and automotive for developing advanced electronic systems. Being proficient in Xilinx ISE requires skills in digital circuit design, programming languages, and FPGA architectures.