This question received a negative score and was flagged as low quality. But while I understand that the question is very, very basic, what makes it unsuitable for an answer?
Things that stand out as low quality, in my opinion
- Very short 1 sentence. Therefore the question lacks clarity, context and purpose. It is hastily written without much real thought.
- "Engine" is a very broad term. Ok it is tagged jet-engine (after a clarification/edit) but there are so many different jet engines, all able to cope differently with different operating modes.