A compass measures direction. It is an essential navigational instrument that indicates the orientation of the Earth’s magnetic field. The compass contains a magnetic needle that aligns itself with Earth's magnetic field lines, pointing toward magnetic north. This allows users to determine their bearings relative to the cardinal directions: north, south, east, and west. Compasses have been used for centuries in exploration and navigation by sailors, hikers, and outdoor enthusiasts. More sophisticated versions, such as GPS devices, have emerged, but traditional magnetic compasses remain popular due to their simplicity and reliability in various conditions.