Aerospace software is the code that flies aircraft, spacecraft, and satellites. It includes flight-control systems (autopilot, navigation, altitude hold), propulsion management, avionics displays, and mission-critical data processing. Unlike consumer software that can crash and restart, aerospace systems cannot fail — a software bug at 35,000 feet kills passengers. This constraint shapes everything: code is verified against formal specifications, tested under extreme conditions, and certified by government bodies (FAA, EASA, NASA) before deployment. DO-178C is the gold-standard certification framework used by every commercial aircraft and military plane in the world.