A geodetic reference frame is a coordinate system used to define the position of points on the Earth's surface. It provides a consistent framework for measuring distances and angles, allowing for accurate mapping and navigation. Common examples include the Global Positioning System (GPS) and the International Terrestrial Reference Frame (ITRF). These reference frames are essential for various applications, such as geodesy, which studies the Earth's shape and gravitational field, and cartography, the art of map-making. By using a standardized reference frame, scientists and engineers can ensure that their measurements are comparable and reliable across different regions and time periods.