Why galvanometer is used?

A galvanometer is a super-sensitive instrument. Its main job is to detect very small electric currents. Think of it as a precise current detector. If even a tiny bit of electricity flows, its needle will move. This sensitivity is why it’s the core component inside traditional analog ammeters and voltmeters. It's essential for finding the presence and direction of a current in many electrical circuits and physics experiments, especially when the current is weak.