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The GPS system, or Global Positioning System, is a network of satellites that orbit the Earth and provide location and timing information to users on the ground. Originally developed for military use, GPS is now widely used in civilian applications such as navigation, mapping, surveying, and tracking.
GPS works by using a constellation of at least 24 satellites that constantly broadcast signals to Earth. These signals are received by GPS receivers, which use the timing information in the signals to calculate the receiver's distance from each satellite. By measuring the distances to multiple satellites, the receiver can determine its precise location on the Earth's surface.
GPS has become an important tool for a wide range of applications, from helping drivers navigate to guiding airplanes and ships to their destinations. It has also been used in emergency situations to locate people in distress, and in scientific research to study the Earth's movements and atmosphere.