What do you mean by op-amp

What do you mean by op-amp? Illustrate briefly.

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The operational amplifier, frequently termed as an op-amp, is a DC-coupled high-gain electronic voltage amplifier by differential inputs and, generally, a single output. Usually the output of the op-amp is controlled either through negative feedback, which largely finds out the magnitude of its output voltage gain or by positive feedback that facilitates the regenerative gain and oscillation.

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