To preserve the values of voltage, current, and resistance within each stage, thecoupling capacitor allows the AC variations to be coupled from an input source but blocks any DC coupling.

In analog circuits, a coupling capacitor is used to connect two circuits such that only the AC signal from the first circuitcan pass through to the next while DC is blocked.

A coupling capacitor is a capacitor that is used to transmit an alternating current signal from one nodeto another.