Define GPS.

GPS, or Global Positioning System, is a satellite-based navigation system that provides location and time information to users anywhere on or near the Earth's surface. Developed and maintained by the United States government, GPS consists of a constellation of satellites orbiting the Earth, transmitting precise timing signals and geographic coordinates to GPS receivers.

GPS receivers, typically found in smartphones, navigation devices, and other electronic devices, receive signals from multiple satellites simultaneously. By calculating the time it takes for signals to travel from satellites to the receiver, along with the satellites' precise positions in orbit, the GPS receiver can determine its own position, velocity, and time. This information is displayed to users in the form of latitude, longitude, altitude, speed, and heading.

GPS is widely used for navigation, mapping, surveying, outdoor recreation, transportation, and various other applications. It has revolutionized the way people navigate and interact with the world, providing accurate positioning and navigation capabilities in both urban and remote areas, under all weather conditions, 24 hours a day.