An ideal op-amp has zero output impedance. This means that the output voltage is independent of output current. So the ideal op amp can drive any load without an output impedance dropping voltage across it. The short summary: input impedance is "high" (ideally infinite), output impedance is "low" (ideally zero).

Does input have high impedance?

In electronics, high impedance means that a point in a circuit (a node) allows a relatively small amount of current through, per unit of applied voltage at that point. ... In audio systems, a high-impedance input may be required for use with devices such as crystal microphones or other devices with high internal impedance.

What is considered high impedance?

High impedance is referred to as 25V, 70V, or 100V (often referred to as 70V). High impedance is ideal for longer cable runs, with more speakers per line. Speakers are low powered with adjustable power taps. It has high impedance outputs with fewer amplifiers required.