Why is the input impedance of op-amp very high and output impedance is very low?

This video explains two characteristics of op-amp: 1. The input impedance and the output impedance. It further talks about why is input impedance very high and output impedance is very low. This video illustrates these two concepts with the help of necessary diagram.
Explanation :The input impedance is very high to avoid any current to into the amplifier so that amplifier can amplify the input signal without any distortion.
The output should be very low so that there should not not be any drop in the output voltage.
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