The Global Positioning System (GPS) is a satellite-based navigation system that provides location and time information anywhere on or near the Earth. This technology was originally developed by the United States Department of Defense for military purposes. The first GPS satellite was launched in 1978. For many years, access was restricted, but in the 1980s, the U.S. government made the system available for civilian use. However, the accuracy for non-military users was intentionally limited. This limitation was removed in the year 2000, which greatly improved its usefulness for the public. The system works using a network of about 30 satellites orbiting the Earth. Each satellite continuously transmits signals containing precise time and location data. A GPS receiver on the ground, such as one in a smartphone or a car, detects these signals from multiple satellites. By calculating the time difference between when a signal is sent and when it is received, the device can determine its exact position. Today, GPS is essential for a wide range of modern applications, including vehicle navigation, mapping services, and emergency response.