What technical characteristic fundamentally differentiates a cruise missile's flight profile from that of a ballistic missile?

The fundamental technical difference between a cruise missile's flight profile and a ballistic missile's is that a cruise missile uses aerodynamic lift throughout its flight to sustain altitude and maintain its trajectory within the Earth's atmosphere, whereas a ballistic missile primarily follows a ballistic trajectory, an unpowered free-fall arc, for the majority of its flight after its initial powered ascent phase. A ballistic missile is launched into space on a trajectory, like a thrown ball, and is only powered during its boost phase. Once the rocket engines cut off, the warhead follows a predictable, though potentially adjustable, arc governed by gravity and air resistance. A cruise missile, on the other hand, functions more like an airplane; it has wings and an air-breathing engine, such as a turbojet or turbofan, which provides continuous thrust. This allows the cruise missile to fly within the atmosphere for its entire flight path, enabling it to adjust its course, fly at lower altitudes, and navigate around terrain to avoid detection. For example, a Tomahawk cruise missile uses its wings and jet engine to continuously fly within the atmosphere, while a Minuteman III ICBM follows a ballistic trajectory after its initial rocket boost.