Which is better? engines under wings or to the rear of an airplane?

I just want to know if there is a reason for the difference. I honestly dont understand why engines are under wings to begin with if the wings depend wind flow for lift. seem in the way to me. but i know nothing about the science behind it so im asking you professionals. none the less. flight itself is just... show more I just want to know if there is a reason for the difference. I honestly dont understand why engines are under wings to begin with if the wings depend wind flow for lift. seem in the way to me. but i know nothing about the science behind it so im asking you professionals. none the less. flight itself is just amazing. those big craft flying like that.. just amazing.
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