Radio interferometry is a technique used in radio astronomy to improve the resolution of images of celestial objects. It involves combining signals from multiple radio telescopes, which are often located far apart. By analyzing the differences in the signals received, astronomers can create detailed images that reveal more about the structure and behavior of distant galaxies, stars, and other cosmic phenomena. This method relies on the principle of interference, where waves from different sources combine to enhance certain features while canceling out others. The resulting data allows scientists to study objects with much greater clarity than would be possible with a single telescope.