An "open rotor" is a type of aircraft propulsion system that features exposed blades, similar to a propeller, but operates more efficiently at higher speeds. Unlike traditional enclosed engines, open rotors can generate more thrust while reducing fuel consumption, making them an attractive option for future commercial aviation. This technology is often compared to turbofan engines, which have enclosed fans. Open rotors can provide significant benefits in terms of performance and environmental impact, as they aim to lower carbon emissions and improve overall efficiency in air travel.