A coronagraph instrument is a device used in astronomy to block out the bright light of a star so that faint objects nearby, such as exoplanets or other celestial bodies, can be observed and studied. Coronagraphs use a combination of masks and filters to reduce the glare of the star and reveal the surrounding objects more clearly. This technology is crucial for the detection and characterization of exoplanets in other solar systems, as well as for studying the structure of planetary disks and other phenomena in space. Coronagraph instruments are commonly used in space-based telescopes and ground-based observatories to enhance the ability to see and study faint celestial objects.