"Suborbital" refers to a trajectory that reaches space but does not complete an orbit around the Earth. This means that a spacecraft or vehicle travels high enough to experience weightlessness and see the curvature of the Earth, but it falls back to the surface before completing a full orbit. Suborbital flights typically reach altitudes above 100 kilometers, known as the Kármán line. Suborbital missions are often used for scientific research, technology testing, and space tourism. Companies like Blue Origin and Virgin Galactic are developing suborbital flights to provide commercial experiences for passengers, allowing them to experience a brief moment in space without the complexities of orbital travel.