Engineering knowledge refers to the body of theoretical and practical understanding that is specific to engineering disciplines. It includes concepts, principles, theories, methods, techniques, tools, and applications that are used in designing, analyzing, developing, testing, and maintaining various systems, structures, machines, devices, processes or services. This knowledge is typically acquired through education, training, experience, research, and development, and it enables engineers to apply their skills and expertise to solve complex problems, create innovative solutions, and make meaningful contributions to society.