The International Terrestrial Reference Frame (ITRF) is a global framework used to define the positions of points on the Earth's surface. It provides a consistent and accurate reference for measuring the movement of tectonic plates, monitoring sea level rise, and conducting geodetic surveys. The ITRF is based on data from various sources, including satellite observations and ground-based measurements. Established by the International Association of Geodesy (IAG), the ITRF is regularly updated to reflect changes in the Earth's shape and rotation. This reference frame is crucial for various applications, such as navigation, mapping, and understanding geological processes.