What's the difference between Electromagnetic lens and an Electrostatic lens?

So I’ve read a couple of pages and watches a few videos but at their core neither has answered this basic question.

I remember from the lecture that the prof. said that one needs a high current while the other needs a high voltage (with low current).

But I don’t remember which is which and also I’d like to learn more about the commonalities and differences of applied electrostatics vs electromagnetism.