Trilateration is a method used to determine the position of a point by measuring its distance from three known locations. This technique is commonly used in navigation systems, such as GPS, where satellites act as the known points. By calculating the distances from these satellites, a receiver can pinpoint its exact location on Earth. The process involves creating spheres around each known point, with the radius of each sphere representing the distance to the unknown point. The intersection of these spheres reveals the precise location. Trilateration is distinct from triangulation, which uses angles instead of distances to find a position.