What is capacitive coupling?

A capacitive coupling is one in which the output of one stage of amplifier is connected to the input of second stage through a capacitor. This is the most frequently used coupling. The coupling capacitor blocks DC signal propagation across the amplifier and allows only AC signals. This makes the circuit analysis and design simplified and each stage can be considered as isolated as far as DC signals are considered. Also it avoids the amplifiers going into DC saturation.