Unidentified flying objects (UFOs) refer to any aerial phenomenon that cannot be immediately identified or explained. These objects can appear in various shapes and sizes, often reported as flying saucers or strange lights in the sky. The term does not imply that these objects are extraterrestrial in origin; rather, it simply means that their nature is unknown at the time of observation. UFO sightings have been reported worldwide, leading to various investigations by government agencies, including the U.S. Department of Defense. Some sightings have been attributed to natural phenomena, man-made aircraft, or atmospheric conditions, while others remain unexplained, fueling public interest and speculation about the possibility of extraterrestrial life.