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What does it mean that an op amp has a high input impedance.. in laymans terms…why is it so important?

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What does it mean that an op amp has a high input impedance.. in laymans terms…why is it so important?

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It means that the OP amp will draw very little current from the source that feeds it and thus have little if any loading effect on that source. Because of it`s high input impedance the OP amp`s input can be from a source that has a high output impedance such as a transistor. I do not agree with responder noplate`s statement that impedance is just a fancy word for resistance. I also disagree with responder Paul F`s assumption that impedance is the same as AC resistance. Capacitive reactance and inductive reactance are both an impedance expressed in ohms but neither contains any AC or DC resistance.

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