Hybrid rockets are a type of rocket propulsion system that combines elements of both solid and liquid rocket engines. They typically use a solid fuel, which is ignited by a liquid oxidizer. This design allows for better control of the thrust and can be safer than traditional solid rockets, as the oxidizer can be turned off or adjusted during flight. These rockets are often used in various applications, including space exploration and commercial launches. Notable examples include the SpaceShipTwo developed by Virgin Galactic, which aims to provide suborbital space tourism, showcasing the potential of hybrid technology in modern aerospace.