Why is it hard to engage/throttle/reignite rocket engines if it’s easy to do so with jets?

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With jet engines, it’s relatively easy to light it up and throttle. I know you can’t shut them down mid-flight and then turn them back on while still in the air, but you can easily throttle them. Now with rocket engines, you can only light most engines 1-3 times, and their throttle ability is minimal. Why is this so?

Thanks in advance.

In: Engineering