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I am currently reading stuff about the propagator and causality in QFT at the moment and I don't really understand it. Could anyone explain this to me?

I understand that a propagator is a function which describes how particles and anti-particles travel from one place to another, but what is it to do with causality? Why is it important if the fields are space-like separated or time-like separated? What does it mean if the propagator does not give zero if it is outside the light-cone? How do we check if Causality is violated or not?

Thank you all!

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# Propagator and Causality

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