The International Celestial Reference Frame (ICRF) is a coordinate system used by astronomers to pinpoint the positions of celestial objects in the sky. It serves as a standard reference for measuring the locations of stars, galaxies, and other astronomical phenomena. The ICRF is based on precise observations of radio sources, which are stable and can be tracked over time. The ICRF is maintained by the International Astronomical Union (IAU) and is crucial for various applications, including navigation, satellite positioning, and understanding the dynamics of the universe. By providing a consistent framework, the ICRF helps scientists communicate and share data effectively across different research fields.