Differential amplifier

A differential amplifier is a type of electronics circuit that amplifies (makes a small signal bigger) the difference between two input signals. It looks like two big blocks with electricity passing through them, side by side. The two input signals go into the two big blocks, and then the output signal is much bigger than what was put in. It's like having two loud speakers and two people talking, one on each speaker, but the amplifier makes the difference between the two voices much louder.