DO-178B/C is a set of guidelines for developing and certifying software in airborne systems and equipment. It ensures that software used in aviation meets strict safety and reliability standards, by requiring rigorous testing and documentation throughout the development process. The certification process includes multiple levels of testing and review, ensuring that software is thoroughly checked and verified to meet these high standards. Ultimately, DO-178B/C certification is required for any software used in commercial and military aircraft, as well as any other airborne system or equipment that requires high levels of safety and reliability.