A Geographic Coordinate System (GCS) is a way to pinpoint locations on the Earth's surface using a set of numbers. It typically uses two main values: latitude and longitude. Latitude measures how far north or south a place is from the equator, while longitude measures how far east or west it is from the prime meridian. Together, these coordinates help us identify any spot on the globe, like New York City or Mount Everest. GCS is essential for navigation, mapping, and various applications in fields like geography, cartography, and environmental science. By using a GCS, we can accurately represent and analyze spatial data, making it easier to understand our world and plan for the future.