Question

what does an operational amplifier do?

Answer 1

It amplifies the input signal to a specific factor

Answer 2

As a matter of fact it is just one use of op amp. It can also be used as a buffer to isolate two circuits or use as an integrator also.

Answer 3

And typically Op amps have very high voltage gains , high input impedance, draw little current at the input, and have low output impedance.

Answer 4

all of the ideal characteristics of an amplifier is in Op Amps... and it can easily be applied in different field of electronics amplifications...