Jet fuel is a type of aviation fuel specifically designed for use in aircraft engines. It is generally an expensive and highly refined petroleum-based product, with special additives that allow it to combust more efficiently at high altitudes and low temperatures. Jet fuel has a higher energy density than other types of gasoline or diesel fuels, meaning it can produce more thrust for takeoff and faster airspeeds during flight. It is also less prone to vapor lock, which means that it maintains its flow properties at high altitudes where the outside temperature is low.