Coronagraphy is an astronomical technique used to study the outer atmosphere of the Sun, known as the corona. It involves using a special instrument called a coronagraph, which blocks out the bright light of the Sun to reveal the faint light emitted by the corona. This allows scientists to observe solar phenomena such as solar flares and coronal mass ejections. By observing the corona, researchers can gain insights into solar activity and its effects on space weather. Understanding these processes is crucial for predicting events that can impact Earth, such as disruptions to satellite communications and power grids.