What is injected into the high pressure air is ignited in a jet engine?

In a jet engine, fuel is injected into the high-pressure air that has been compressed by the engine's compressor. This fuel is typically aviation kerosene, such as Jet A or Jet A-1. Once injected, the fuel mixes with the compressed air and is ignited in the combustion chamber, producing high-temperature, high-pressure exhaust gases that propel the engine and generate thrust.